| The Earth is between the Sun and the Moon during a ____. |
drumlin |
| The tide stages are flood tide, high tide, ____ tide, and low tide. |
ebb |
| Clay, humus, sand, and ____ (quartz grains) are found in soil. |
full moon |
| About 66 million years ago, a massive ____ hit the Earth. |
meteorite |
| The Earth's atmosphere is mostly ____ and oxygen (O2) gasses. |
nitrogen |
| An underwater earthquake could generate a ____. |
ozone |
| A ____ is an elongated whale-shaped hill formed by a glacier. |
silt |
| A molecule of ____ contains three oxygen atoms. |
tsunami |
