Science 2nd grade | UNIT 2: Looking at rocks 2.3 soil
Rocks can be found in soil.
We use soil to grow our food. Without soil we would have no food.
Look at some soil. You will see:
- living things
- things that have died
- small pieces of rock
Soil needs all these things.
Large rocks under the soil wear down slowly. They break into smaller pieces. The smaller pieces end up in the soil.
These small rocks can make the soil sandy (like sand) or more like clay.
Sometimes a rock in soil is called a stone.
Activity 2.3 (Finding the rock in soil)
You will need: different soil samples - plastic bowls of water - a hand lens
Look at each soil sample. Do they look the same?
Put a little of each soil into its own bowl of water.
Shake the bowl slowly so that the water moves around the bowl. Look at the pieces of rock and other material. Draw what you see in the soil. Say how the soils are different.