The first answer is volcanoes
The second answer is They move because of convection currents in the mantle
Is a substance that speeds up a chemical reaction, but is not consumed by the reaction
Answer:
Ionic compounds, such as salt, can dissolve in water, as can most polar molecules such as sugar.
Explanation:
POLAR
A control group is different because it is not what is being tested. for example the control group would use sugar pills while the other group uses the pills being tested
