According to the information in the diagram, which layer of the earth is liquid?

a. crust
b. mantle
c. outer core
d. inner core

It is c. naturally in the environment

Geothermic gradient is the rate of increasing temperature with respect to increasing the depth in the earths interior. away from tech tonic plates boundaries, it is about 25-40 c/km (72-87 degrees f/mi) of depth near the surface in most of the world.

Answerscripps institution of oceanography; i believe this is correct plz check first good luck;