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

Having read the above passage, choose the right answer to the following question (choices are lower. or higher ):


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 1 mile into the Earth's temperature is lower. or higher? 

