Across
- 4. a measurement of the surface of something
- 6. an image that helps you understand the number or amount of something
- 7. an educated guess about a number
- 8. water with salt in it, such as the ocean
Down
- 1. all the water (solid, liquid, gas) on and around planet Earth
- 2. water that is not salty, such as the water in most lakes and rivers
- 3. recorded measurements or observations
- 5. how much space something takes up