Module 4 Review:

A deep sea trench occurs at what type of plate boundary?

This layer of the crust is below the mantle and is made up of molten nickel and iron.

The upper part of the Earth's mantle that can flow is called the __.

What occurs as the plastic mantle flows from hotter less dense rock to cooler more dense rock?

There are two types of crust that make up plates. Which is more dense?

What is common at plate boundaries?

Wegener proposed that all continents were joined at one time in a supercontinent called __.

___ explains HOW continents have moved over time.

The two forces that help move plates are __

Which of the following is NOT evidence off the continents moving over time?

In 1915, this scientist presented lots of evidence for the theory of continental drift

The two types of seismic waves that scientists use are __.

Hot spots usually occur ___.

What type of plate boundary is found at the Mid-Atlantic Ridge?

Alternating __ in the ocean showed the ocean floor spreads out from mid-ocean ranges.

Which letter shows a deep sea trench?

What technology helps scientists map the ocean floor by sending out pings?