Unit 4 & 5

Soil is important for plants to grow and make food for living things.

• TRUE

• FALSE

Define soil degradation

• when soil quality is better

• when soil quality is poor

• when soil quality is better

Three causes of soil degradation are

• forest fires

• mining

• planting new tree

• deforestation

Planting new trees and making compost STOP soil degradation

• True

• False

Sound is made when objects vibrate

• TRUE

• FALSE

What is a vacuum

• full space that sound cannot travel

• deep space that sound cannot travel

• empty space that sound cannot travel

Sound travel in what state of matter the fastest?

• liquid

• solid

• gas

Answer explanation

Frequency is the speed of the vibration that makes the sound

• TRUE

• FALSE

Pitch is the softness and loudness of sound

• FALSE

• TRUE

Intensity is the lowness and loudness of sound

• TRUE

• FALSE

Answer explanation

It is the softness and loudness of sound