Read the passage below and choose the right answer to the following question (choices are lower. or higher ):

Temperature increases with depth inside the Earth, so melting of rocks is more likely to occur at greater depths.


Mark studies rocks for a living. He is curious if rocks deeper in the Earth will be warmer or cooler. If Mark were to take the temperature of a rock that is half a mile into the Earth's surface, and then take the temperature of a rock 1 mile into the Earth's surface, he would find that the rock half a mile into the Earth's temperature is lower. or higher? 

