-One plate (denser) going under another plate (lighter) when they collide
-results in seafloor trenches, thickening of the lithosphere, and volcanic activity when the plate melts into magma

layers of the earth

These occur where two plates slide toward each other.

-result from the cooling and solidification of hot fluid materials (magma)

These occur when two plates slide apart from each other.

A type of rock that forms when particles from any type of rock are pressed and cemented together
-forms due to erosion and weathering of other rocks

-Authorizes the sale of federal public lands for the purpose of mining hardrock minerals and fuels
-So old very little environmental protection considered.

These occur where plates slide past each other in opposite directions.

The friction and stress buildup from the sliding plates frequently causes earthquakes, a common feature along transform boundaries.

A type of rock that forms from an existing rock that is changed by heat or pressure

1977, requires coal strip mines to reclaim the land (more on a state level)

It states that Earth’s lithosphere is divided into a small number of plates that float on and travel independently over the mantle, with much of Earth’s seismic activity occurring at the boundaries of these plates.

An example of Transform boundaries