Compositional Layers

Name the three layers if earth

What is the crust?

The crust is composed mainly of rocks that contain minerals rich in ______ and _______.

Earth’s crust has two parts: ________ crust, which makes up the landmasses, and ________ crust, which underlies the oceans.

The oceanic crust is made of mostly dense, dark gray or black, fine-grained rock called granite. True or False?

The oceanic crust is only ___ km thick on average.

Continental crust is _______ —on average, it’s about 40 km from the top to the bottom.

Continental crust is thicker—on average, it’s about ____ km from the top to the bottom.

The vertical positioning of Earth’s crust due to its flotation in the mantle is called _______.

What is Isostasy?

Isostasy is also the reason that the oceanic crust sits lower in the mantle than the continental crust. True or False?

What is mantle?

The mantle’s thickness is _____ km from the bottom of the crust to the top of the core

But mantle rock has proportionately more ________ and ______ than the crust, and it contains a high proportion of ________ too.

The core is a huge ball of cold water. True or False?

The core has a radius of about ______ km—approximately the distance from San Francisco to New York.

What we do know about the core comes mainly from ________ , the study of earthquake waves.

How many naturally occurring chemicals?

Earth’s elements are distributed evenly. True or false?

Which crust makes up landmasses?

Which crust underlies the oceans?

Both the oceanic crust and the continental crust are composed mainly of ______ and ______ with smaller amounts of other elements

Isostasy explains why ______ roots rise up.