primary 3 one

what is soil

• The the growing of crops

• Top layer covering the earth's surface

• Amoint of mineral salts in water

The gas in air needed for burning is called ____________

• oxygen

• Carbon dioxide

• nitrogen

The top layer of soil is called ________.

• bedrock
• topsoil
• subsoil
• grass

This is found in the topsoil and is made of decaying plants and animals. 

• dirt
• water
• humus
• subsoil

This type of soil is sticky when wet and hard when dry. 

• clay
• silt
• sand
• gravel

This type of soil is best for plant growth. 

• rock
• sand
• loam
• clay

Air has no weight.

• True

• False

Which gas is the most common in our air?

• Nitrogen

• Hydrogen

• Helium

• Oxygen

Air pressure is measured with a

• thermometer

• hot-air balloon

• satellite

• barometer

What is wind?

• Moving air

• stopped air

• hot moving air