Rocks and Soils

Front

What is soil?

Back

Soil is the loose upper layer of the Earth's surface made up of air, water, humus (decayed plants and animals), and broken bits of rocks and minerals.

Front

How do geologists classify rocks?

Back

Geologists classify rocks by their physical attributes.

Front

Why is soil important for plants?

Back

Soil is important because it is essential for plant growth, holds nutrients for plants, and provides a habitat for many animals.

Front

What are the characteristics of silt?

Back

Silt has medium particles, can hold nutrients for long periods of time, holds water well, is good for farming, but erodes easily.

Front

What are the characteristics of clay?

Back

Clay consists of fine particles, holds water for a long time, but is hard for roots to take hold.

Front

What is the main component of soil?

Back

The main components of soil are minerals, organic matter (humus), air, and water.

Front

What is humus?

Back

Humus is the decayed organic material in soil, made from dead plants and animals.

Front

What is the difference between rocks and minerals?

Back

Rocks are made up of one or more minerals, while minerals are naturally occurring inorganic substances with a specific chemical composition.

Front

What is loam?

Back

Loam is a type of soil that is a mixture of sand, silt, and clay, making it ideal for farming.

Front

What is erosion?

Back

Erosion is the process by which soil and rock are removed from the Earth's surface by wind, water, or ice.