Paragraph: (Science-textbook/science-g4-47.txt)
Sent 1: Heat supplies the energy that causes motion.
Sent 2: The deeper you go into toward the Earths core, the hotter it gets.
Sent 3: At the core it is really hot.
Sent 4: All that heat tries to rise toward the surface.
Sent 5: In the Mantle, the rock is partially melted and is able to move.
Sent 6: As it is heated, the material in the mantle moves toward the surface.
Sent 7: As the mantle material rises, it cools.
Sent 8: When it reaches the Earths crust, it is mostly stopped.
Sent 9: A little of the material can break through the surface, but not all.
Sent 10: Instead, it begins to move horizontally.
Sent 11: The mantle material moves horizontally away from a mid-ocean ridge crest.
Sent 12: Toward the surface, the mantle material starts to cool.
Sent 13: As it cools it sinks back down into the mantle.
Sent 14: These areas are where deep sea trench occur.
Sent 15: The material sinks back down to the core.
Sent 16: The system operates like a giant conveyor belt.
Sent 17: The motion due to heating and cooling is called convection.

Question: What can the motion of convection be compared to? (true/0)

Question: What kind of feature occurs where cooled mantle material sinks back down into the mantle? (true/1)

Question: What happens to the cooled mantle material that does not break through the surface? (false/2)

Question: What happens to the heated material in the mantle as it rises toward the surface? (false/3)

Question: Where does the heat deep in the Earth try to go? (false/4)

Question: Why does the system work as a conveyor belt? (false/5)

Because it has a structure like a conveyor belt
The material sinks back down to the core
Heat supplies the energy for motion
Because the motion between heating and cooling
Due to motion
Because the material moves horizontally
Because the material goes and comes up down in a cycle
Because the mantle goes up and down

Question: Which direction does the mantle move? (false/6)

Vertically
Horizontally
It goes down
It moves horizontally

Question: What happens when the mantle material that is near the surface starts to cool? (true/7)

It sinks back down into the mantle
It continues going toward the surface
It starts moving horizontally
It stops

Question: Where do sea trenches occur? (false/8)

Question: Does rock move more at the surface of the earth or at its core? (true/9)

At the surface because there is more space
At the Surface
At its core because it has more heat
At its core

Question: What is the coolest part of the earth? (true/10)

The mantle
The equator
The core
The surface

Question: The hottest part of the earth is? (false/11)

Question: Why does the material move horizontally? (true/12)

Because it moves away from the ocean ridge crest
Because it cannot break through the surface
It can't break through the surface
Because it is cooler
Because it reaches the core