Geosphere Layers of the Earth

DO NOW… I can…identify the layers of the geosphere and understand their properties Question: What happens to pressure as there is an increase in atmosphere? DO NOW… QUIZ THURSDAY!!!!!

The Earth as a System (review) Integrated system of rock, air, water, and living things. This system is divided into four parts: atmosphere (air) hydrosphere (water) biosphere (living things) geosphere (rock)

Geosphere Solid part of the Earth’s crust that consists of all rock, and the soils and sediments on Earth’s surface. Most located in Earth’s interior

Composition of the Earth Three layers: crust mantle core Density increases towards the center of the Earth

Crust Thin, outer layer. Made up of light elements less than 1% of Earth’s mass 5-70km thick

Mantle Layer beneath the crust 64% of mass of Earth 2,900 km thick Made of lithosphere asthenosphere mesosphere

Lithosphere Outer layer cool, rigid divided up into huge tectonic plates

Asthenosphere 250 km thick solid, plastic layer made of rock flows very slowly and allows tectonic plates to move across

Mesosphere 2,250 km thick “middle” sphere lower part of mantle

Core 3,248 km radius sphere of hot, dense nickel and iron 1/3 of the Earth’s mass Made of Outer Core Inner Core

Outer Core; 2,200 km thick, outer shell, made of liquid nickel and iron Inner Core: 1,228 km radius; a sphere of solid iron and nickel

Earth’s Interior Seismic Waves: the waves that travel through the Earth’s interior during an earthquake. Altered by the type of material that it travels through.

Seismologists Scientists who measure changes in these waves to determine that the earth’s interior is made in layers.

First Life??? First life may have first evolved deep in the crust and then migrated to the surface when conditions became favorable. “extremophiles” Hypothesized that the biomass below the surface far exceeds the biomass at the surface.

Be able to draw and label the three layers of the earth (crust, mantle, and core) as well as the 5 layers based on physical properties (lithosphere, asthenosphere, mesosphere, outer and inner core).