Glossary

Continental drift is a theory that states continents move around the surface of the Earth over time due to the movement of the lithospheric plates the continents sit on.

Convection cells are circular cells of material movement caused by temperature differences within a body of liquid or gas.

A convergent plate boundary is where two or more tectonic plates come together. Convergent plate boundaries are considered to be destructive boundaries Earth crust is destroyed.

The core is the innermost layer of the Earth. The Earth's core is partially molten and is composed of iron and nickel. 

The crust is the rocky outermost layer of the Earth

A divergent plate boundary is where two or more tectonic plates come separate.

Fossils are the preserved remains or traces of animals, plants, or other organisms that lived in the past. Some of the places fossils may be found are rocks, oceanic sediment, or ice.

Lithospheric plates are the fractured plates that make up the surface of the Earth. They are composed of continental or oceanic crust.

The Earth's mantle is a highly viscous layer between the crust and the core.

A scientific theory is an explanation or model used to explain observations or experimental results about an observed phenomenon.

A viscous material is not solid, but has a relatively high resistance to flow; viscous materials may be sticky or gum-like. An example of a viscous material is molasses.