Before lava reaches the surface, the molten material is called
a. rock.
b. magma.
c. volcanic ash.
d. liquid fire.

all of the following are examples of physical properties except
a. melting point.
b. hardness.
c. ability to burn.
d. density.

before reaching surface molten material is called magma

the ability to burn is not a physical property

For the first one- B. Magma (I don't think there is a need to explain this..)

Second question- C. ability to burn 
A physical property doesn't change a material's actual composition, just the way it looks, and/or it can be measured without changing a material's chemical composition. Melting point, hardness, and density apply to this, while the ability to burn does not. 

where are the sentences?

Explanation: