| 1. |
A simple device that does work. This includes the pulley, the wheel and axle, the lever, the inclined plane, the screw, and the wedge.
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| 2. |
Using a force to move an object across a distance. This is equal to the product of force times distance.
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| 3. |
A simple machine with 2 or more inclined planes.
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| 4. |
A simple machine with a flat surface set at an angle to a horizontal surface. A playground slide is an example of this.
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| 5. |
A simple machine that has a bar which moves on or around a fixed point and can be used for lifting things. A seesaw is an example of this.
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| 6. |
A push or a pull.
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| 7. |
A huge underwater mountain chain that zig-zags around some of the continents and circles much of the earth.
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| 8. |
A deep ocean valley that forms where two plates move away from each other.
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| 9. |
This is a part of the mid-ocean ridge and goes right through the middle of Iceland.
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| 10. |
The fixed point or support on which a lever turns when moving. The center support of a seesaw is this.
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| 11. |
A simple machine with a round frame that turns around a central rod called an axle.
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| 12. |
A theory that explains the movement of the Earth's continents. Also called continental drift.
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| 13. |
A large mass of ice that moves very slowly through a valley or down a mountain.
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| 14. |
An earthquake that occurs under water may create this giant wave.
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| 15. |
This occurs when running water, sea waves, wind, or glaciers pick up and carry away materials from the earth's surface.
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| 16. |
A simple machine that has a wheel over which rope or chains are pulled.
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| 17. |
The large landmass or the one "supercontinent" that is believed to have connected all of the continents on earth about 225 million years ago.
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| 18. |
A part of erosion where rocks, minerals, and immature soils at or near the earth's surface are broken down into smaller pieces.
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| 19. |
A simple machine that consists of an inclined plane that twists around a central axis.
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| 20. |
A vent or hole in the surface of the Earth. When this erupts, it may release gases that come from the inside of the Earth.
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| 21. |
An instrument that detects and records earthquake vibrations.
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| 22. |
Plates that move toward each other and collide.
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