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Definition
One of the major pieces that make up Earth’s upper layer. |
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Term
| Theory of plate tectonics |
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Definition
The theory that pieces of Earth’s outer layer are in constant motion. |
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Term
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Definition
The state in which one object’s distance from another is changing. |
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Term
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Definition
A place or object used for comparison to determine if an object is in motion. |
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Term
International System of Units
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Definition
A system of measurement based on multiples of ten and on established measures of mass, length, and time. |
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Term
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Definition
The basic SI unit of length. |
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Term
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Definition
The distance an object travels per unit of time. |
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Definition
| The overall rate of speed at which an object moves; calculated by dividing the total distance an object travels by the total time. |
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Definition
| The speed of an object at one instant of time. |
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Definition
| Speed in a given direction. |
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Definition
| The steepness of a line on a graph, equal to its vertical change divided by its horizontal change. |
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Term
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Definition
| The rate at which velocity changes. |
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