Earth

Vocabulary

Earth- the planet third in order from the sun, having an equatorial diameter of 7926 miles (12,755 km) and a polar diameter of 7900 miles (12,714 km), a mean distance from the sun of 92.9 million miles (149.6 million km), and a period of revolution of 365.26 days, and having one satellite.

Mantle- the portion of the earth, about 1800 miles (2900 km) thick, between the crust and the core.

Crust- the outer layer of the earth, about 22 miles (35 km) deep under the continents (continental crust) and 6 miles (10 km) deep under the oceans (oceanic crust).

Core-the central, innermost, or most essential part of anything.

How do geologists learn about Earths interior?

Geologists have used two types of evidence to learn about Earth's interior: direct evidence from rock samples and indirect evidence from seismic waves.

Crust

Some features of the crust are: oxygen and silicon. The crust that is beneath the ocean floor is called the oceanic crust and some of its features are: basalt. The crust that creates continents is called the continental crust. Some of its features are: granite.

Mantle

About 40 km deep, the mantle is a really hot layer of rock. Some of the mantles features are: the lithosphere, the asthenosphere, and the the mesosphere.

Core

Below the mantle is the core, some of the features of the core are: the outer core and the inner core.