Download earth - kendricknovak

Welcome back
What are the 4 branches of Earth Science?
Geology
Meteorology
Oceanography
Astronomy
Agenda
1. Earth Notes
– Draw earth
2. Earth’s Four Spheres
QUIZ NEXT CLASS
EARTH
• Third planet from the sun
• 4.6 Billion years old
• 70% is covered with water
• Shape = oblate spheroid (slightly flattened
sphere)
• Study the upper few kilometers by drilling
• Study interior using seismic (shock) waves
Layers of Earth
Crust
• Thin, solid, outermost
• 1% of Earth’s mass
• Oceanic crust: crust
beneath oceans
• Continental crust: makes
up the continents
Mantle
• Layer under the crust
• 2,900 km thick
• 66% of Earth’s mass
Core
•
•
•
•
Center
33 % of Earth’s mass
Outer Core = liquid layer
Inner Core = solid layer
Answer these questions
(in your notebook)
1. Write down the 3 layers of Earth
Crust
Mantle
Core
2. How do we study the deepest parts of Earth?
Seismic Waves
Structural Zones of Earth’s Interior
• lithosphere -solid, the crust and rigid upper
part of the mantle
• asthenosphere -solid, plastic layer of the
mantle beneath lithosphere
– allows for tectonic plates to move
• mesosphere -the
“middle sphere”;
• Between
asthenosphere and
outer core
• Below the mesosphere
is the liquid outer core
Draw the Earth
• You will be creating a drawing
of the earth
Objectives
• Know, understand, and
describe where the different
layers of the Earth are
• Know and describe the 4
spheres
Earth’s Four Spheres
The Atmosphere
• Atmosphere: gases that
surround the Earth
• Shields Earth from sun’s
UV light
The Hydrosphere
• Hydrosphere: all of the
Earth’s water (except
water vapor)
• Water covers 70% of
Earth’s surface
• 97% of Earth’s water is in
the oceans
• 3% is freshwater – lakes,
rivers, streams, frozen
glaciers, groundwater
The Geosphere
• Geosphere: solid, rocky part
of Earth
• From core to surface of crust
• Natural processes move
matter in and out of Earth
– Ex. Volcanoes
The Biosphere
• Biosphere: all forms of
life on Earth