1. In the spring, when the sun shines and warms the earth, the ground begins to .......... .

2. In the fall, people often .......... and gather leaves that fall from the trees in their yards and parks.

3. In the winter, bears and frogs fall into a deep sleep and then, in the spring, they wake up from .......... .

4. In the spring, .......... sprout. They are small plants that form from seeds. They are young plants that usually need to be transplanted into larger areas so that they can grow into larger plants and trees.

5. In many countries around the world, people use a common, metric measuring system called the .......... unit in order to measure temperature fluctuations in the weather.

6. In the United States, people use a common measuring system called the .......... unit of measure in order to gauge temperature fluctuations in the weather.

7. A .......... eruption is a natural explosion that forms below the earth's surface and is blown out onto the earth's shell. It's then followed by extremely hot, molten rock and ash.

8. A weather .......... is an instrument that points out or reveals the wind direction.

9. People often go to beaches or lakes during the hot, summer months in order to escape the .......... .

10. A .......... front happens when chilly, wintry air replaces warmer air in any region.