Earth Sciences

Alexander Parkes, an English inventor, is credited with creating the first man-made plastic in 1856 called Parkesine. This early form of plastic was derived from cellulose and was used as a replacement for ivory.

Approximately 71% of the Earth's surface is covered by water. This is mainly in the form of oceans, but also includes other bodies of water such as lakes and rivers.

Density currents play a crucial role in distributing nutrients and oxygen throughout the deep ocean, supporting marine life in these regions. These currents also help to transport organic material and provide a means for organisms to disperse over vast distances, facilitating biodiversity and ecosystem connectivity in the deep sea.

weathering and erosion

you can't find it in earth's crust

The first of the ionized layers in the earths atmosphere were discovered in the 1920s (?) by scientist Heavyside, to reflect radio waves.

The E layer is about 100 km high but this varies with day/night.

The F layer is above this again, (about 250 km from memory).

There is also a D layer, lower than the E, but seldom does one use this for reflecting radio waves. E and F layers are important for long-distance radio communication.

The layers of the atmosphere are ionized by incoming radiation from the sun; hence the variation in height.

The height depends upon the atmospheric composition, and the penetrating ability of the incoming radiation.

construct a more complete picture of the history of life on Earth. By comparing the fossils found in different rock sequences, paleontologists can determine the relative ages of the fossils and the environments in which they lived. This allows them to piece together the evolutionary timeline of various species and ecosystems across different regions.

Without any living things on Earth, including humans, the planet would be devoid of all life. Ecosystems would collapse, leading to a cascading effect on the environment, such as reduced biodiversity, disrupted nutrient cycles, and altered climate patterns. The Earth would essentially be a barren and lifeless world.

Water returns to the atmosphere through a process called evaporation. When the sun heats up water bodies like lakes, rivers, and oceans, the water molecules gain enough energy to change into water vapor and rise into the air. This water vapor eventually cools and condenses into clouds, which then release precipitation back to the Earth as rain or snow.

S-Waves, or shear waves cannot travel through the liquid outer core because liquids have no shear and therefore shear waves cannot propagate through them

http://en.wikipedia.org/wiki/S-wave

The Earth's orbit around the sun causes different parts of the planet to receive varying amounts of sunlight throughout the year, leading to the changing of seasons. When a specific region is tilted towards the sun, it experiences summer due to more direct sunlight, while when tilted away, it experiences winter due to less direct sunlight. The tilt of the Earth's axis is what creates this phenomenon.

During the day, clouds help reflect sunlight, reducing the amount of solar radiation that reaches the Earth's surface and thereby moderating temperature. At night, clouds act as a blanket, trapping heat and preventing it from escaping into the atmosphere, which can result in warmer temperatures near the surface.

Girls can build muscle mass and gain weight by following a structured exercise program that includes strength training and consuming a diet that is high in calories and protein. It's important to consult with a healthcare professional or a nutritionist before making significant changes to your diet or exercise routine.

You can feel air moving against your skin through its temperature, pressure, or humidity changes. You might also feel air by the movement it causes, such as a breeze or wind brushing against your skin.

Oil was first discovered in the ancient Near East around 4,000 years ago. The first recorded use of oil was for medicinal purposes and later for waterproofing boats. The modern oil industry began in the mid-19th century with the drilling of the first oil well in Pennsylvania in 1859.

Water on Earth is primarily found in its hydrosphere, which includes the oceans, seas, lakes, rivers, and groundwater. It also exists in the atmosphere as water vapor and in the cryosphere as ice caps and glaciers. Collectively, these sources make up Earth's water resources.

Blue Springs is a type of aquatic biome found in regions where clear, deep freshwater springs discharge water. These biomes are characterized by their crystal-clear blue water, often resulting from the high mineral content in the spring water. Blue Springs contain unique plant and animal species adapted to the specific conditions of these environments.

The ancient Greek philosopher Pythagoras is often credited with first suggesting that the Earth is not flat, but rather a sphere, around the 6th century BC. This idea was further developed by other ancient scholars, such as Aristotle and Eratosthenes.

Generally, it's the type with the most clay at the surface. Clay type soils are least permeable, especially when disturbed or compacted when wet by agricultural or forestry heavy machinery. The permeability rate of soil can be somewhat inversely related to it's porosity. Clay soils are very porous, since they can hold more water than a sandy or loamy soil type. However, rate of infiltration and permeability are slow. it can take a long time for water to soak into the soil (rain water entering soil prevents over land flow and therefore flooding). Sandy soils are able to quickly absorb water and generally have higher permeability.

Caveat - Sandy soils, in temperate and subtropical climates, often have a limiting clay layer somewhere below the surface that restrict water flow through the soil profile at certain depths.

Hope this helps...

Bill

No, approximately 71% of Earth's surface is covered by water, while only about 29% of the surface is land.

Earth's mantle is a rocky shell about 2,890 km (1,800 mi) thick that constitutes about 84 percent of Earth's volume. Two main zones are distinguished in the upper mantle: the inner asthenosphere composed of flowing rock in the state of plasticity, about 200 km thick, and the lowermost part of the lithosphere, composed of rigid rock, about 50 to 120 km thick. A thin crust, the upper part of the lithosphere, surrounds the mantle and is about 5 to 75 km thick. The mantle is divided into sections which are based upon results from seismology. These layers (and their depths) are the following: the upper mantle (starting at the Moho, or base of the crust around 7 to 35 km, downward to 410 km), the transition zone (410-660 km), the lower mantle (660-2891 km), and in the bottom of the latter region there is the anomalous D" layer with a variable thickness (on average ~200 km thick)

The majority of Earth's freshwater is found in glaciers and ice caps, accounting for about 68.7% of the total freshwater. Other sources include groundwater at 30.1%, while surface water like rivers, lakes, and swamps only make up about 0.3% of the freshwater supply.

When gases heat up, the molecules gain kinetic energy and move faster, increasing the pressure and volume of the gas. This leads to expansion of the gas, causing it to occupy a larger space. Additionally, heating gases can also cause them to undergo a phase change, such as turning from a gas to a plasma.

Some minerals found in Florida include limestone, phosphate rock, and kaolin. These minerals are important for various industries in the state, such as construction, agriculture, and ceramics.

Members of Eukarya have membrane-bound organelles, such as a nucleus and mitochondria, which are absent in members of Eubacteria. Eukaryotic cells also have linear chromosomes and undergo mitosis during cell division, features not found in Eubacteria. Additionally, eukaryotic cells have a more complex cytoskeleton compared to Eubacteria.

Nuclear meltdown occurs when fuel rods in a nuclear reactor produce too much heat, causing them to melt. This can lead to the release of radioactive materials and poses a significant risk to both the environment and human health. Cooling systems failure is a common cause of nuclear meltdowns.