*Question*
Temperature increases with depth inside the Earth, so melting of rocks is more likely to occur at greater depths. What happens when we head from the core towards the surface of the earth temperatures decrease or temperatures increase?
**Answer**
temperatures decrease

*Question*
With a higher concentration of hydrogen ions, a solution is more acidic but has a lower pH. Dean wants his solution to be as acidic as possible, so his concentration of hydrogen ions will be lower or higher?
**Answer**
higher

*Question*
When a volume of water is cooled, the molecules move less vigorously, so same number of molecules takes up less space and the water is denser. Sean is trying to see how fast the water molecules are moving in a container of water. He observes that the molecules are moving very quickly, so the temperature must be cool or warm?
**Answer**
warm

*Question*
With a higher the concentration of hydrogen ions, a solution is more acidic and has a lower pH. James wants to create a solution that is less acidic than others, so his concentration of hydrogen ions will be higher or lower?
**Answer**
lower