During endocytosis and exocytosis, cells

During endocytosis and exocytosis, cells actively transport molecules across the cell membrane. In endocytosis, a cell membrane brings a particle into the cell while in exocytosis, a particle is released by a cell, then moved it to the cell surface to fuse with the cell membrane.

The study of where things are 

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.