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Earth’s Interior
Interior=inside
Geologist
• A geologist is a scientist that studies the
forces that shape earth’s surface
• 200 years ago was the start of geology
• Geology is fairly new
Rock
• The material that forms Earth’s surface
• Geologists study rocks
Forces that shape Earth
• Constructive
• Destructive
Constructive
• Building up
Ex. Construction
The building (MS) was changed
constructively.
Constructive
• Mountain ranges forming(slowly)
• Over millions of years
Destructive
• Forces that slowly wear down the Earth’s
surface
• Destroy =Destruction
Destructive
• Erosion by wind and water
• Think of our local beaches
Journey to the Center of the Earth
• Temperature increases
• Pressure increases
How do we know what inside Earth
is like if we can’t travel through it?
• Scientist know this by studying seismic
waves/data from earthquakes
If you took that journey you would
find layers of the Earth
• Crust
• Mantel
• Core
Crust
•
•
•
•
“skin” of earth
Like the shell of an egg or onion skin
VERY THIN!!!!!!
Includes land on bottom of ocean floor
– Thinnest under the ocean(basalt)
– Thickest under mountains(granite)
• Is part of the lithosphere
• Most abundant element oxygen then
silicon
Lithosphere
• Lithosphere means stone
• Crust and uppermost mantle
• Rigid
• Contains plates
Oceanic vs. Continental Crust
Oceanic
Continental
Under oceans
Under continents
thinner
thicker
Made of basalt(think salty ocean)
Made of granite
More dense
Less dense
Asthenosphere
•
•
•
•
•
•
Gooey/bendable
Plastic like rock
Convection take place here
Found in Upper mantle only
NOT A LIQUID!!!!
SOLID
Mantle
• A layer of hot rock
• is also part of the lithosphere
Core Center of the Earth)
• Inner core
• Outer core
Outer core
• Acts like a thick liquid
Inner Core
•
•
•
•
dense ball of solid metal
Heat source for convection
Hotter than the sun
Spins-creates earth’s magnetic shield
The Lithosphere
•
Crust and uppermost mantle
Floats on the asthenosphere
Broken into pieces- tectonic plates
Crust
• Crust part of the (Lithosphere)
– Continental
– Less dense
– Oceanic
– More dense
Mantle
– Upper Mantle called the asthenosphere
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