The Earth!!!

In science class, we are now learning and studying about Earth Science. The subject we are talking about now is layers of the Earth. Some of the key words we had to define were: seismic waves, pressure, crust, basalt, granite, mantle, lithosphere, asthenosphere, outer core, and inner core.

Definitions:

seismic waves- Waves that are produced when earthquakes occur.

pressure- Results from a force pressing on an area.

crust- The layer of rock that forms Earth's outer skin.

basalt- Dark rock with a fine texture.

granite- A rock that usually is a light color and has a coarse texture.

mantle- A layer of hot rock.

lithosphere- The uppermost part of the mantle and the crust together.

asthenosphere- Part of the mantle that is soft.

outer core- A layer of molten metal that surrounds the inner core.

inner core- A dense ball of solid metal.

These are a few of the most important words you should know about the Earth.

A theory that many scientists are working on right now has to do with Pangaea. When volcanoes erupt, the lava and magma spread, causing the land to expand. So, when the lava reaches sea, it extends the borders of Hawaii into the Pacific Ocean.

Three main layers of Earth:

* Crust

* Mantle

* Core

Temperature:

* For every 40 meters down into the Earth's core, the temp. rises 1 Celsius degree.
* When you first start off, the temp. is cool, but then it begins to get warmer.


Crust= 5-70 km thick
Mantle= 2,867 km thick
Outer Core= 2,266 km thick
Inner Core= 1,216

In my opinion, I think learning about the Earth and its layers is very interesting. Before I learned all of these facts, I didn't really understand the Earth's layers. Now I know that they are the Mantle, Crust, and Core. Those are the three main important layers. I would really like to learn more about the Earth and all of its amazing details.


Here are a few sites you can visit to learn more about the Earth and its features: