Study guide of 4th

Two reasons of why birds need hollow bones?

• To be happy

• It makes the bird's body lighter

• Air spaces in hte bones provide them with extra supply of air

• To walk slowly

How do a bird's feathers keep it warm?

• The air under the feathers, is trapped and stays warm.

• The feathers are always warm

• The feathers have unicorn's magic

How much of the earth's surface is covered with water?

• Three quarters

• Two cuarters

• One quarter

• Six quarters

What are clouds made of?

Which kind of cloud is light and feathery?

• Cirrus

• Cumulus

• Stratus

Which kind of cloud sometimes forms thunderstorms?

• Cirrus

• Cumulus

• Stratus

Which kind of cloud is called fog when it is very close to earth?

• Cirrus

• Cumulus

• Stratus

What percentage of your body is water?

• 66%

• 65%

• 81%

• 97%

What happens to your body if you do not replace the water your body loses each day?

• It is harder for the heart to pump blood

• Your body takes the water out from your lungs

What is matter?

• Ideas

• Things that are always combined with water

• Anything that takes up space and has weight