6th Grade Unit 3 Practice Earth's Layers and Plate Tectonics

Front

What is the inner core of the Earth?

Back

The inner core is the solid, innermost layer of the Earth, composed mainly of iron and nickel, and is solid due to extremely high pressure despite its high temperature.

Front

Why is the inner core solid despite its high temperature?

Back

The pressure is too high for liquid to form.

Front

What happens to the density of Earth's layers as you go deeper?

Back

Density increases with depth.

Front

What is continental drift?

Back

Continental drift is the theory that continents have moved over geological time and were once joined together.

Front

What was one criticism of Wegener's theory of continental drift?

Back

Lack of evidence for similar fossils.

Front

What evidence do glacier scars in Africa provide?

Back

They suggest that Africa was once in an area of the Earth that had a very cold climate.

Front

What type of boundary is associated with earthquakes but not volcanic activity?

Back

Transform boundary.

Front

What are tectonic plates?

Back

Tectonic plates are large sections of the Earth's lithosphere that move and interact with each other.

Front

What is a convergent boundary?

Back

A convergent boundary is where two tectonic plates move towards each other, often causing mountains or subduction.

Front

What is a divergent boundary?

Back

A divergent boundary is where two tectonic plates move apart, often creating new crust as magma rises.