What causes a convection current to rise?
Simple Answer:
Warm air rises during convection. Perhaps better said, natural convection of air is the rising of less-dense warm air relative to the more-dense cold air.
This is a simple matter of buoyancy. Gravity pulls everything downward, but the pull is proportional to mass and items immersed in a fluid that have lower mass per unit volume than the fluid will tend to float, i.e. experience a buoyant force up as gravity pulls harder downward on the surrounding fluid.
Causes and Explanation:
Everyone says "Warm air rises" and that is an example of natural convection. Convection requires a fluid, heat source and gravity. The heat source causes a temperature gradient in the fluid so that buoyancy of the warmer fluid causes it to rise.
Buoyancy is the reasons bubbles rise and hot air balloons float and anything light, like a piece of wood, raises to the surface. The gravitational force experienced by a volume of material is just its weight, i.e. mass times gravity. Mass is the density of the material times its volume. So, if the object (like wood) has a lower density than water, the force of gravity on the object is less than the equivalent volume of water. The buoyant (upward) force is the difference in the wight of the object and the weight of the same volume of liquid.
Light objects experience the upward buoyant force and if the fluid (air or water or any fluid) is heated and expands, then it has a larger volume and less density and it also experiences the upward force.
The natural buoyancy of warmer fluids causes the force that moves the fluid and that movement is what we call natural convection.
Other Aspects:
How long does it take to make a wave cut platform?
The formation of a wave-cut platform can take thousands of years, depending on factors such as the energy of waves, the type of rock being eroded, and the rate of sea level change. Erosion by waves gradually wears down the coastline, forming the flat rocky surface known as a wave-cut platform.
What kind of fossil is a leaf inprint?
It is formed slat rock and covered up with layers and layers of rock and sediment.
Is granite made from magma and trapped in earth's crust?
Yes, granite is an igneous rock that forms from the slow cooling of magma deep within the Earth's crust. It is typically made up of quartz, feldspar, and mica minerals, and can be found in continental crust around the world.
The Earth consists of four main layers: the inner core, outer core, mantle, and crust. The inner core is solid and composed mainly of iron and nickel. The outer core is also composed of iron and nickel, but it is in a liquid state. The mantle is a semi-solid layer made up of silicate rocks, and the crust is the Earth's thin, solid outermost layer.
A name of a spanish palaeontologist?
EMILIANO AGUIRRE ENRÍQUEZ Paleontologist at the most important resource worldwide.
What are the cities around Okeefenokee Swamp?
Some cities around the Okefenokee Swamp include Folkston in Georgia, Fargo in Georgia, and Hilliard in Florida. Folkston serves as the gateway to the Okefenokee National Wildlife Refuge and is a popular starting point for visitors exploring the swamp.
What are the major geologic events in the Permian period?
During the Permian period, major geologic events included the assembly of the supercontinent Pangaea, significant climatic changes leading to glaciation and warming events, and massive volcanic activity resulting in the formation of the Siberian Traps. These events had significant impacts on biodiversity and led to the largest extinction event in Earth's history, known as the Permian-Triassic mass extinction.
How does the thickness of the atmosphere affect the thickness of the Earth?
10 kilometers if you walk straight up.
The lower seven-tenths of the Atmosphere exists in the first 10 kilometers of altitude.
Consider a storm that is 500 [or a thousand] km across and only 10 km thick! Talk about 'Thin as a piece of paper'!
What caused the first land masses to form on earth?
Granitic crust, a.k.a continental crust, began to form, which happened to be less dense than oceanic crust. Therefore, the continental crust went on top of the oceanic, thus creating the first land mass on Earth.
What occurs during the decomposition of iron ore?
During the decomposition of iron ore, heat is applied to break down the ore into iron and carbon dioxide. This process is usually done in a blast furnace, where the iron ore is mixed with coke (a form of carbon) and limestone. The limestone helps to remove impurities and creates slag, while the coke provides the carbon needed to reduce the iron ore to molten iron.
Why didn't some plants and animals rot away when they died?
They do, it does take some time though, and to "rot" there has to be enough humidity and airborne microbes.
If the plants and animals got covered relatively quickly by mud from a flooding river or ashes from a volcano then they would not have had time to rot.
What is the order in which sediments are laid down in water?
Sediments are typically laid down in water in the order of largest to smallest particles, with larger particles settling first due to gravity. This process is known as sedimentation and results in a layering effect known as sedimentary rock formation.
How did earth's organisms change during the first period of Paleozoic era?
During the first period of the Paleozoic era, the Cambrian period, there was an explosion of biodiversity known as the Cambrian Explosion. Many new types of organisms evolved, including the first trilobites, mollusks, and brachiopods. This period marked the appearance of complex multicellular life forms and the development of hard parts like shells and exoskeletons.
How many medicine wheels are there in the world?
There are many medicine wheels found across North America, primarily among Indigenous cultures. The exact number is unknown as they hold spiritual significance and meaning to the communities that use them.
What forces shape the surface of the earth?
Geologic forces that shape the Earth are weathering and erosion (from wind, ice, water, and gravity) and the results of plate tectonics (volcanism, earthquakes, mountain building, subduction, crust creation).
The increase of dissolved materials in oceans is the result of?
The increase of dissolved materials in the ocean is as a result of constant washing of solid particles from rivers into the ocean. Metals such as lead make it from industries into the ocean due to river pollution.
Why are fossils more likely to be formed in shale and sandstone than in conglomerate?
Shale and sandstone are fine-grained sedimentary rocks that compact well to preserve fossils due to their low porosity and permeability. Conglomerate, being a coarse-grained rock with larger particles and higher porosity, tends to have more spaces for organic material to decompose or be destroyed before preservation can occur.
What dangers might travelers face?
Travelers may face dangers such as theft, scams, natural disasters, transportation accidents, health risks, and political unrest, depending on the destination they are visiting. It is important for travelers to research their destination, stay informed about current events, take necessary precautions, and have travel insurance to mitigate these risks.
Felsic lava is a slower moving lava, with high silica content. Most felsic lava deposits as granite, granite, muscovite, and orthoclase.
What animals lived in the Quaternary Period?
During the Quaternary Period, animals such as mammoths, sabertooth cats, woolly rhinoceros, giant ground sloths, and early humans roamed the Earth. The Quaternary Period also saw the rise of modern mammal species like elephants, bears, and wolves.
What fossil forms an empty space left in a rock?
A fossil mold forms when an organism's remains decay and leave behind an empty space in the rock where it was once located. This empty space can then be filled with minerals to create a fossil cast.
What is the Archaologists' name who found the oldest human fossils in the Great Rift valley?
The archaeologist who found the oldest human fossils in the Great Rift Valley is Dr. Richard Leakey. He discovered the fossils in the Turkana Basin in Kenya, which have provided important insights into human evolution.
What does the diversity of species have to do with fossil records?
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Which stress force pulls on the crust and stretches rock?
Tensional stress force pulls on the crust and stretches rock. This type of stress occurs where tectonic plates are moving away from each other.