Formation of soil

What do you call it when you break down rocks into smaller pieces?

• Plant remains

• Weathering

• Decompose

• Trees

Soil is composed of all of these natural materials EXCEPT

• weathered rock
• plant matter
• plastic substances
• animal remains

Plants and animals become part of soil when they -- 

• Die and Decay
• Produce offspring
• Grow and Develop
• Take in nutrients

Rocks near the ocean get broken into smaller pieces. What causes this change to these rocks?

• Leaves falling from trees
• Clouds forming in the sky
• Water crashing against the rocks
• Salt dissolving in the water

A student made a mixture of sand, tiny rocks, small twigs, and some leaves. This student has modeled - 

• how rocks change over time
• the life cycles of plants
• the formation of soil
• how landforms are created

Where do the nutrients in soil come from?

• dead plants and animals

• small pieces of rock

• water

• the sun

Soil contains ……………..,………………… and…………………

• soil, water, plastic

• air, water and minerals

• oxygen ,water, sand

• sand, dirt, water

Define humus.

• The decomposition or break down of dead plants and animals with the soil

• The decomposition or break down of plastic with the soil

• The decomposition or break down of dead plants only with the water

• The decomposition or break down of dirt with the soil

1.What is soil?

• the bottom layer of the earth where plants grow is called soil.

• the topmost layer of the earth’s surface where plants grow is called soil.

• the bottom layer of the earth where plants cannot grow is called soil.

• the middle layer of the earth where plants grow is called soil.

What is the meaning of decompose?

• to rot and break down the remains of plants and animals in smaller pieces.

• a mixture of sand, silt, clay, rock, and humus.

• the breakdown of rocks into very small particles by water, wind, and ice.