The four layers that make up the Earth are the inner core, ____________, mantle, and crust.

The slow movement of material in the mantle, that is neither solid nor liquid, is caused by heat and ___________.

When lava cools cools it hardens and becomes rocks called ___________.

In the 1960s, scientists formed a new theory called _________. It explains how parts of the crust and mantle are broken up into sections that fit together but move against each other.

When two tectonic plates crash together this is called __________.

The process of a heavier tectonic plate sliding under a lighter tectonic plate is called _________________.

_________________ are formed when tectonic plates are moving apart and molten rock slows up from the mantle into the space between them on the ocean floor.

Inge Lehmann was a Danish scientist who studied

Select all the following that name tectonic plates. Use the map on pages 18 and 19 in your reader.