Transcript “Out” Question

Welcome! Please set up your notebook and answer this
“In” Question: If a tree falls in the forest and nobody is around to hear it,
does it make a sound? Be sure to answer in complete sentences.
Layers of the Earth
In Question:
Out Question:
9/15/2011
Layers of the Earth
9/15/2011
Introduction to Planet Earth
Let’s dig a hole to China!
Earth Stats
• The Earth's mass is about 5.98 x 1024 kg.
• Earth is the densest planet in our Solar
System (mass/volume).
• Earth is made of several layers with
different compositions and physical
properties, like temperature, density, and
the viscosity (ability to flow).
The Composition of
the Earth
Draw this
diagram on the
right side of your
notebook on the
outside of your
foldable.
The Composition of
the Earth
Crust
•Thinnest layer (5-100 km)
•Two types of crust
•Continental
•Average 30 km thick
•Less dense
•Oceanic
•Average 5-8 km thick
•More dense
•What is it like?
•Graham crackers
The Composition of
the Earth
Mantle
•Molten to solid-like rock
•Extremely Thick! (2,900 km)
•Iron and Magnesium
•It is too far down to drill
•How do we know what it is
made of?
•Scientists infer based on:
•Pushed up rock
•Ocean floor/molten rock
•What is it like?
•Peanut butter
www.soc.soton.ac.uk
The Composition of
the Earth
Core
•Pretty darn big. (6,856 km)
•(Slightly bigger than Mars!)
•33% mass of the Earth
•Scientists think….
•Made mostly of iron
•Some nickel, sulfur, oxygen
•What is the evidence?
•The particular way seismic
waves travel
•Earth’s Magnetic field
•What is it like?
•Jelly and Milk chocolate
N
S
The Composition of
the Earth
N
Outer Core
• Liquid iron and nickel
• 2,200 km thick
Inner Core
• Solid iron and nickel
• 1,228 km thick
S
The
Structure
of the
Earth
Lithosphere
Solid
Asthenosphere
Viscous Liquid
Outer Core
Liquid
Mesosphere
Solid
Inner Core
Solid
Lithosphere = ‘rock sphere’
Crust and upper rigid part of Mantle
Asthenosphere = ‘weak sphere’
Middle part of Mantle
Mesosphere = ‘middle sphere’
Lower mantle close to core
“Out” Question: Write the layers of the Earth from the outside to the inside.
Be sure to answer in complete sentences.
Layers of the Earth
In Question:
Out Question:
9/15/2011
Layers of the Earth
9/15/2011