Grade 3 - Rocks & Soil

Which category does HUMUS belong in?

• Living 
• Non-living 
• Once living

What are the 3 layers of soil (in order from top to bottom) that we have learned?

• Subsoil, Bedrock, Topsoil
• Topsoil, Subsoil, Bedrock
• Topsoil, Humus, Tundra

What forms after a rock has been weathered over many years?

• streams
• lakes
• soil
• valleys

Which type of soil holds water the best?

• sand
• silt
• clay
• bedrock

Sand feels___________ and is made up of ____________ rock particles.

• smooth, large
• sticky, small
• grainy, small
• grainy, large

Which of these is a reason soil is an important resource?

• It helps plants grow
• It allows us to grow food
• It allows us a solid place to build homes and buildings
• all of the above

Soil is a __________ resource

• capital

• human

• natural

• basic

What do you call the process where over many years, rocks are broken down by weather, water, and living things?

• weathering

• precipitation

• evaportation

• pollution

This particle of soil is the biggest and made of small grains of worn down rock. It does not hold water well and has few nutrients

• silt

• clay

• sand

What are the components of soil?

• rock, trees, sand, clay, and worms

• humus, rock, sand, silt, and clay

• worms, trees, sand, rock, and plants

• rock, clay, sand, silt, and nutrients