Lesson 4: What Do You Know?

True or False

Statement
   
1 Heating an object always increases its temperature
   
2 A hot cup of coffee absorbs cold from the room.
   
3 Ice made from fresh water always has a temperature of zero degrees celsius
   
4 Melting snow cools the nearby air.
   
5 Consider a sample of water at 20 degrees Celsius. If its temperature decreases by a few degrees, its volume will increase.
   
6 Consider a sample of water at 20 degrees Celsius. If its temperature increases by a few degrees, its density will decrease.
   
7 Increasing temperature causes all substances to expand (increase volume).
   
8 Sometimes when you step out of a shower or rub alcohol on your skin, your skin feels cool. This is mostly due to liquid evaporating from the skin.
   
9 Life preservers help people to float because they make them weigh less.
   
10 Seawater is denser than fresh water. A boat sailing from fresh water to salt water will float higher in the water.
   
  
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Learn more about ocean warming in the Student Guide, Lesson 4 .