Electric motors and doorbells are similar in that they are all made from___________.
electromagnets
100
The concentration of energy begins with producers where there is a lot of energy that originally comes from the _______.
sun
100
If a mineral can be scratched by your fingernail, is the hardness of your mineral less than or greater than
4?
about 2.5
100
An example of a chemical reaction is: A. Water freezing to become ice, B. Mixing vinegar and baking
soda, C. Filtering sand from salt water, D. Separating iron filing from sand using a magnet.
B
100
Name the process where water will become very cold and become a solid.