1. Aim: How do we compare the spheres of the Earth? Do Now: Earth’s Sphere’s Worksheet

2. How do we describe the lithosphere? Lithosphere Solid Layer Most dense Composed of Rock and Soil Oxygen and Silicon – 2 most abundant elements Thickness from 72 to 153 kilometers Has other elements – aluminum, iron, calcium, sodium Solid rock material under ocean sediments Continuous bedrock shell around the earth Known as the Crust

3. How do we describe the hydrosphere? Hydrosphere Liquid Layer Oceans, lakes, rivers, streams, & groundwater Oceans average depth of 3-5 km Cover’s 70% of Earth’s surface Less dense than the lithosphere Earth’s thinnest layer Water composed of 33% oxygen and 66% hydrogen 99% salt water & 1% fresh water

4. How do we describe the Atmosphere? Atmosphere (Troposphere) Gas Layer Least dense of all the spheres Consists of 4 layers – troposphere, stratosphere, mesosphere, and thermosphere We live in the troposphere layer (lowest layer) Troposphere - only layer that contains water vapor and weather conditions Air mixture consists of 78% Nitrogen and 21% Oxygen Troposphere- temperature decreases with increasing altitude Troposphere contains the most mass of the atmosphere

5. HighDensityLow LithoHydroAtmosphere Draw a bar graph to show the relationship between the density of each of sphere