Chapter 3 Vocabulary Seismic waves Pressure Crust Basalt Granite CRUST: Continental or oceanic Seismic waves Pressure Crust Basalt Granite Mantle Lithosphere Asthenosphere Mesosphere Outer core Inner core Lithosphere Asthenosphere Mesosphere Outer Core: Liquid Inner Core: Solid

How do Geologists learn about Earth’s interior? Evidence from rocks Scientists drill for rocks. We have drilled 7 miles deep. Sometimes volcanoes blast rock out from deep within the earth (62 miles deep!) Scientists experiment on rocks in the laboratory to see how rocks react to extreme pressure Evidence from seismic waves Waves generated inside the Earth from Earthquakes Scientists study how the waves travel to determine what's inside the Earth Seismic waves tell us where the material inside the Earth changes. Example: from Rock to liquid We can look at the path the wave takes…. Like waves around an island in the ocean.

What are the features of the Earth’s Crust, Mantle and Core? The three main layers of Earth are the crust, the mantle, and the core. These layers vary greatly in size, composition, temperature, and pressure. The deeper down inside the Earth, the greater the pressure on the rocks down there The temperature increases as you go deeper into the Earth.

The Crust The crust is a layer of solid rock that includes both dry land (continental) and ocean floor (oceanic) The main elements are oxygen and silicon It is the upper most layer and is the thinnest of all the layers Continental crust is mostly granite and is thicker than Oceanic crust which is mostly basalt.

The Mantle The rock is very hot but solid. It is nearly 1864 miles deep. The lithosphere The Astehnosphere The mesosphere

The core The core is made mostly of the metals iron an nickel. Outer core: around the inner core, it is a layer of molten metal Inner core: at the center of the Earth is a dense ball of solid metal

What does the core have to do with Earths magnetic field? Movement within the liquid outer core is believed to create earths magnetic field. The Earth is like a giant magnet. This is why a compass points to magnetic north and not true/geographic north.