| A | B |
|---|
| mountain | landform with the highest elevation |
| migration | people moving from one place to another |
| climate | weather over a long period of time |
| polar zones | areas above the Arctic Circle and Antarctic Circle |
| Pangaea | all the continents connected |
| hurricane | tropical cyclone that forms over the Atlantic Ocean |
| deciduous trees | trees that lose their leaves |
| water | covers more than 70% of the earth's surface |
| earthquake | blocks of Earth's crust rub against each other |
| atmosphere | layer of gases above the Earth's surface |
| geography | study of the earch |
| environment | natural surroundings |
| century | 100 years |
| urban | living in the city |
| one year | time it takes Earth to travel around the sun |
