6th Grade Review

Which of the following is NOT one of the three layers of soil?

• topsoil
• undersoil
• subsoil
• bedrock

Which of the following is NOT one of the three types of soil?

• clay
• sand
• silt
• mud

Humus is.....

• the dead parts of plants and animals in soil.
• A food we eat with pretzels.
• The tiny particles inside of soil
• The roots that come off of a plant and live in soil.

What is a soil problem all farmers face?

• soil hardening
• soil erosion
• soil spoiling
• soil pollution

_______ is the type of soil used most often with plants. It is a mixture of clay, sand, and silt.

• loam
• humus
• mud
• dirt

Which layer of soil is on the bottom?

• topsoil
• subsoil
• bedrock
• bottomsoil

Electromagnetic waves________________travel through space.

• Never
• Cannot
• Can
• Wish they could

The blue section of the wave is measuring _________________.

• wavelength
• crest
• trough
• amplitude 

_____________________light is the only type of EM wave detected by the human eye.

• Red
• Gamma
• Microwave
• Visible

_______ carry the greatest amount of energy. 

• x-rays
• gamma rays
• infrared rays
• visible light