| A | B |
|---|
| Earthquakes often occur when two | tectonic plates slide past each other |
| Most of Earth's salt water is stored in the | oceans |
| Weathering | is the most common cause of erosion |
| Earth's axis | is an imaginary line around which it turns |
| The theory of plate tectonics | helps explain how forces below Earth's surface have shaped our landforms |
| A revolution is | the 365 1/4 day trip Earth takes around the sun each year |
| Latitude is | the distance north or south of Earth's equator |
| The water cycle is | the movement of water from Earth's surface to the atmosphere and back |
