The Moho refers to the boundary between the crust in the mantle, and occurs because… a. The mantle is hotter than the crust
b. The mantle is more dense than the crust
c. The mantle is liquid
d. The mantle is less dense than the crust

Which of the following is not considered one of the four major oceans (1 point)

Seed plants that lived during the carboniferous impact life on earth today because a. they are the ancestors of all plant life on earth. b. their remains formed coal, which is an important resource. c. they produced fossils that are used to date many geologic events. d. their presence caused oxygen levels to drop, allowing animals to evolve.

How do ocean currents affect temperature? check all that apply. they carry cold water from the poles to the equator and cool air over land. they flow north and then south below the equator. they flow south and then north above the equator. they move warm water from the equator to the poles and heat air over land. they move east to west and create prevailing winds. they move west to east and create seasonal winds.