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Science

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The observation, identification, description, experimental investigation, and theoretical explanation of phenomena is all part of science. Nothing is immune to the scientific process: from charm quarks that haven't existed naturally since the beginning of time to Pluto, recently demoted from planet to dwarf planet. Questions on knowledge about the material and physical aspects of our world are asked and answered here.

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no
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What is positive crystal
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It got warm.
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Because the words we use are derived from a time when people used base twelve rather than base ten. Also the reason for "dozen" & "gross". It goes back about 500 years or so.
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about 80 percent of the planet's earthquakes appear along the pacific ocean . and the circle of the area is called the "ring of fire", because there are a lot of violent activities . most earthquakes come up at the place where are huge rock plates conflict against each other . although the influence…
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Yes it is a Blood Vessel
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The first person (animal) to get a disease.
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A reflex arc doesn't go all the way up to the brain. Thus it NEVER becomes part of the thought process.
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It is possible for sand grains to be pulverized into finer silicate dust or silt, or crushed and mixed with other minerals as clay.
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In cells control center of cells is the nucleus. It controls the cellular activities
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Camels have many adaptations to desert life, including: long eyelashes to keep out the sand thick hooves to resist the heat of the sand the ability to get water from their food so they don't need to drink often. they have large fat stores in their humps in case it's a long time between meals they …
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In your cheeks. (towards the back of your mouth, on the sides.
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Please be more specific.
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Insulators (glass, rubber, etc).
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The current water vapor content of the air (in question) AND the maximum amount of water vapor that it could carry.
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If the light is strong enough, a shadow is formed. But if that object is a cloud, a rainbow may be formed.
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Collectively, power plants that use natural gas, oil, or coal are known as "fossil fuel power plants" but they are usually identified by the primary fuel and are not freely interchangeable.
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Bases (antacids).
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Yes, phosphorus consists of P4 molecules which are arranged in molecular crystals bound by van der Waals forces. Each phosphorus atom is bound to three others in a tetrahedron.
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About 150 million years ago.
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Neurotransmitters. It's purely chemical.
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Positive & negative respectfully.
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Why should it ... that's not a requirement for survival - it may not even be consistent with survival. After all, if you KNEW that life was just an illusion would you bother to work very hard to survive.
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As few as possible.
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Several trillion (actually, over time, many trillion).
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The boy - he's grounded, but kite string in a poor conductor.
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When two complex chemicals in the body interact, they become attached to each other. This often requires that they fit together in very specific ways, like a key in a lock, otherwise no result happens. Examples are smells, where each receptor in the nose detects only molecules with certain groups on…
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Same as any other food - "space food" is just dehydrated normal food.
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there are a few hundreds through out the whole world
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Scientists treat all theories the same way, popular or not. They will reject any theory if evidence appears which contradicts it.
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After two gametes fuse to form a fertilized egg, it starts to divide into more cells. In humans, this ball of cells becomes implanted in the wall of the uterus.
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Deeezzz nuttz
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its either the cell membrane, molecules, or plasma
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No, this is backwards. When air gets warm it can hold more water vapour so liquid water will evaporate.
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Nothing conducts cold, really. Materials conduct heat, rather than the lack of it, and rubber has a low thermal conductivity, and is therefore considered a thermal insulator.
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All solids have a fixed shape unless acted upon by a force. If the temperature remains constant they have a fixed volume.
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1/2
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1/2
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Many chemical and physical processes, including biochemical ones, take place at the surface of cells. Therefore, increasing the surface area will increase the rate of the processes, whereas more compact shapes will slow down the process.
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In short, it is used in the Calvin-cycle to reduce CO2 into a sugar.
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Clyde Tombaugh's project had been passed down to him by Percival Lowell, who had observed that the orbit of Uranus deviated slightly from what was expected. Lowell believed that this deviation was due to the gravitational influence of a planet beyond Neptune. The existence of Neptune had also been p…
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You would usually put a layer of insulation, often plastic, around a wire which carries electricity. However you may be looking for the magnetic field which forms when a current flows.
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A train travels fairly large distances so kilometres would be an appropriate unit for length. Hours would be the best unit for time, so speed would be in kilometres per hour. We don't really metricate time in most applications.
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Elements in the same column have the same number of valence electrons, and form ions with the same charge.
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an idea that is supported by many different experiments
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CH2F2 has hydrogen bonds between molecules. So it has a higher melting point.
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No. Green plants generate the oxygen that animals must breath and are the base of all food webs.
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Aluminum, sulfur, fluorine, phosphorus, iodine, and neon
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It is the element Neon. It is a noble gas
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No, dissolving does not break covalent bonds. The molecules separate because intermolecular forces such as dipole-dipole attractions are disrupted.
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White sugar is sucrose, C12H22O11. Its elements are carbon, hydrogen and oxygen.
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valence electrons, there can be 1 to 8 of them in the outer s orbital and 3 p orbitals.
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9 is 12% of 75 9 is 1/2 of 18
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If you drop it from a certain height the first bounce will be ideally about 90% of height, at best, on a smooth hard surface, or 0.9 h. On the tenth bounce it is 0.9 to the 10th power or about 35%,or 0.35 h.
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Sandstone can be metamorphosed into quartzite. Heat and pressure bake the sandstone and it becomes extremely hard.
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Carbon is an element. No element contains anything but itself.
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It means that there is a very small gene pool. There are only a few characteristics passed around.
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Satin is a fabric formed by a particular weaving technique called 'float' weaving, where there is a long distance between intersections of the warp and weft threads. The fibre is often silk, but may also be cotton or rayon.
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Power is work divided by time. 10 J in 5 s means the machine develops 2 watts of power.
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are there going to y more canyons
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Saturn does not have any land; it is a gas planet with no solid surface.
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A chemical difference is that sodium reacts with water to make an alkali, and chlorine plus water give acids. A physical difference is that sodium is a solid at room temperature and chlorine is a gas.
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The digestive system.
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yes Mt Pinatubo is a composite volcano
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Water is split into hydrogen & oxygen, the hydrogen is added to CO2 (to make sugar) and the O2 is discarded.
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Not to Earth life.
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From the size of the sun (about a million miles diameter) down to half that size.
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When water runs over limestone in the presence of carbon dioxide, calcium ions and hydrogen carbonate ions pass into the water. CaCO3 + H2O + CO2 = Ca(HCO3)2 Water also self ionizes so there will also be hydrated hydrogen ions and hydroxide ions.
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A hygrometer measures the moisture content of the air. There are several different types, all of which measure something else which indicates the moisture content.
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Benjamin Banneker was an inventor, and an astronomer.
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Conduction & convection. The convection part is when the warm air moves upward.
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All currents are caused by differences in pressure.
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That's negative feedback. Positive feedback ruins homeostasis.
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Those letters will spell the word arcane, an adjective that describes a noun as mysterious and difficult to understand.
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Helium is stored under pressure, so a lot is packed into a small space. The gas in the balloon is at only slightly more than normal air pressure. The helium spreads out as it fills the balloons.
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Water flow, and changing water table levels.
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Butterfly yes - to find food (flowers). Owls, probably not ... detecting motion would be more critical.
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Yes. Convection currents move hot materials to other places.
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Studying cause & effect.
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Brightest planet (wanderer) from earliest human history.
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That's what sound IS ... What we think of as sound are those vibrations that we can detect (with our ears).
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At the right time and place they can cause rare chemical reactions to occur ... but their "side effect" is that they cause considerable cell damage. A good third of cell metabolism is spent getting rid of free radicals and the damage they cause.
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For what, by whom. So both yes & no.
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Its near the pole(s), where change is happening faster.
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