|The mass of a penny is about 2.5 ____.
|A 132 lb woman has a weight (mass) of about 60 ____.
|One gallon of water has a weight (mass) of about 8.3 ____.
|The three ____ of matter are solid, liquid, and gas.
|One gallon of water has a volume of about 3.8 ____.
|Five kilometers (km) is about 3.1 ____.
|A water molecule (H2O) has one oxygen and two hydrogen ____.
|Coal, natural gas, and petroleum are types of ____.