What is the general trend of temperature inside Earth?

Correct answer: It increases with depth

The direct answer is B: temperature generally increases with depth inside Earth. Earth is not equally cool throughout. Heat remains from Earth’s formation, radioactive decay produces additional heat, and pressure and hot material contribute to the high temperature of deeper layers. Reasoning: move downward from the surface; the geothermal gradient normally shows rising temperature; deeper rocks and the core are therefore much hotter than the crust. A is wrong because it reverses the general trend. B is correct, though the exact rate is not identical everywhere. C is wrong because Earth’s interior is not at zero temperature. D is wrong because the increase is not limited to the crust; deeper layers are also extremely hot. This does not mean every small place has exactly the same temperature, only that the broad internal trend is upward with depth. Exam cue: deeper inside Earth means greater heat.