Chapter 2 Section 2

Forces of Change

Earth's Structure

Our planet has multiple layers such as the core, mantle, and crust. Mantle is where or is the outer core of our planet.

There once was a landform called Pangea which was all of our modern day continents put into one massive landform. There is a theory that says that they drifted apart forming our modern day continents, and this theory was called continental drift.

Internal and External Forces of Changes

Subduction occurs when a heavier plates sinks beneath the lighter plate. Accretion is when a sea plate goes beneath a continental plate. Sea plates can also pull apart from one and other in a process called Spreading. Transforming plates can create folds, faults, and earthquakes. Volcanoes are formed when magma emerges from the earths crust. Weathering is the breaking down of rock into sediments. Erosion is the carrying off of these sediments. The most common types of erosion are wind, water, and glacial. Wind erosion carries fertile farmland across the world and it is called loess. Glaciers can carry piles of rock and debris around until it melts dropping everything it contains into the ocean which is called moraines.