There are two basic types of plates: plates, which are thin and dense, and plates, which are thicker and less dense.

There are two basic types of plates: OCEANIC plates, which are thin and dense, and CONTINENTAL plates, which are thicker and less dense.

According to theory of tectonic plates, the denser plate usually sub ducts underneath the less dense plate. Due to this reason, the oceanic plates sub duct under continental plates, that proves oceanic plates are more dense than continental plates.

d. the weight of the book

the transfer for conduction is the heat transfering from the liquid to the spoon

the transfer for convection is the heat rising from the liquid to the air

the transfer for radiation is the heat going through the sides of the cup and to the air

at least that is what i would do