Rocks, soil, and land are parts of Earth that students can see in parks, yards, beaches, and mountains. This cheat sheet helps Grade 2 and 3 students identify common rocks, understand what soil is made of, and describe landforms. It uses simple ideas and clear examples so young learners can connect science words to the world around them.
Key Facts
- Rocks are solid, natural materials from Earth, and they can be sorted by color, size, shape, and texture.
- Soil is made from tiny pieces of rock, dead plants and animals, water, and air.
- Humus is the dark part of soil made from once-living things, and it helps plants grow.
- Weathering breaks rocks into smaller pieces by wind, water, ice, plant roots, or temperature changes.
- Erosion moves rock and soil from one place to another by wind, water, ice, or gravity.
- A landform is a natural shape on Earth’s surface, such as a hill, mountain, valley, plain, or island.
- Topsoil is the upper soil layer where many plant roots, insects, and worms are found.
- People use rocks, soil, and land for building, growing food, making roads, and finding natural resources.
Vocabulary
- Rock
- A rock is a hard, natural solid found in or on Earth.
- Soil
- Soil is the loose material on Earth’s surface where many plants grow.
- Landform
- A landform is a natural shape of land, such as a mountain, hill, valley, or plain.
- Weathering
- Weathering is the breaking of rocks into smaller pieces.
- Erosion
- Erosion is the movement of rock or soil by water, wind, ice, or gravity.
- Humus
- Humus is dark soil material made from dead plants and animals.
Common Mistakes to Avoid
- Calling every small rock a pebble, because pebbles are only one size of rock and rocks can be many sizes.
- Thinking soil is only dirt, because soil also has air, water, tiny rocks, and parts of once-living things.
- Mixing up weathering and erosion, because weathering breaks rocks apart while erosion moves the pieces away.
- Saying landforms are made by people, because landforms are natural shapes on Earth’s surface.
- Forgetting that soil changes over time, because rocks can break down and dead plants can add humus to soil.
Practice Questions
- 1 A student finds 3 smooth rocks and 2 rough rocks. How many rocks did the student find in all?
- 2 A soil sample has 4 small pebbles, 6 grains of sand, and 1 leaf piece. How many items are in the sample?
- 3 Name two landforms and describe how they look.
- 4 A stream carries sand from one part of a park to another part. Is this weathering or erosion, and how can you tell?