EARTH SCIENCE
Published on Nov 18, 2015
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EARTH SCIENCE
EARTH'S CORE, INNER CORE, AND CONTINENTAL DRIFT
CONTINENTAL DRIFT
In 1915, the German geologist and meteorologist Alfred Wegener first proposed the theory of continental drift, which states that parts of the Earth's crust slowly drift atop a liquid core. The fossil record supports and gives credence to the theories of continental drift and plate tectonics.
http://www.enchantedlearning.com/subjects/dinosaurs/glossary/Contdrift.shtm...
Photo by garryknight
CONTINENTAL DRIFT
Wegener hypothesized that there was a gigantic supercontinent 200 million years ago, which he named Pangaea, meaning "All-earth".
Pangaea started to break up into two smaller supercontinents, called Laurasia and Gondwanaland, during the Jurassic period. By the end of the Cretaceous period, the continents were separating into land masses that look like our modern-day
EARTH'S CORE
The earth is split into 3 layers. The outer-most is the crust.
The next layer is the mantle. The inner-most is the core.
EARTH'S CORE
The Earth has three major layers. All known life exists on the solid outer layer, called the crust. Beneath the crust is the mantle, a gooey, hot layer of magma and other semi-solid rocks and minerals. Movement in the mantle leads to tectonic activity, such as volcanic eruptions and earthquakes, on the crust.
EARTH'S CORE
Scientists say the outer core is made mostly of iron and nickel. Iron and nickel are two important metals found everywhere on the planet. (On the surface of the Earth, these metals are found in solid form.) Iron and nickel in the outer core form an alloy, or a mixture of metallic elements. The outer core is approximately 2,300 kilometers (1,430 miles) thick. The alloy of the outer core is very hot, between 4,000 and 5,000 degrees Celsius (7,200 and 9,000 degrees Fahrenheit).
EARTH'S INNER CORE
The Inner Core is the final layer of the Earth. It is a solid ball made of metal. To learn about what metal the Inner Core is made of, read this section about the Inner Core. You can also learn how hot the Inner Core is, how thick it is and some interesting facts about the Inner Core.
http://gamediv1.weebly.com/inner-core.html
EARTH'S INNER CORE
The Inner Core is about 5000-6000 degrees Celsius. It melts all metal ores in the Outer Core causing it to turn into liquid magma.
Photo by Derringdos
