Peeling back the layers
Define Lithosphere
The hard, solid layer on top of the mantle.
a region where two plates are spreading apart
divergent plate boundary
Define geological time
time periods of thousands, millions, and billions of years
How is sedimentary rock formed?
Sediments are pressed and glued together over long periods of time
What is the "Ring of Fire" (+2)
Where most earthquakes and volcanoes happen. (Cool Johnny Cash song)
Define asthenosphere
below the lithosphere, depths of 100 km and about 250 km, weak, soft layer, that can flow and change shape
a region where two plates are moving toward each other
convergent plate boundary
idea that the continents were once joined together?as a single large continent and then slowly moved great distances apart
Continental drift
What 3 things will increase the risk of a landslide?
large amounts of rainfall
an earthquake.
previous landslides in the area.
steep terrain
Best teacher ever
Mr. Walsh
define plate boundaries
Places on the surface where two or more of Earth’s plates meet
region where two plates move past each other
Transform plate boundary
What is the best time of the day?
nap time, lunch/dinner time, end of school day
How can damage from earthquakes be minimized?
better building codes
How do you find the area of a triangle?
base x height divided by 2 or...
1/2 base x height
Where do earthquakes and volcanoes typically happen?
At plate boundaries
Large underwater volcanic mountain chains that form along divergent plate boundaries
mid-ocean ridges
theory that the lithospheric plates move over long periods of time
plate tectonics
What two things can reduce the danger of volcanic eruptions?
evacuation routes and supply kit
What is author's purpose? (4)
an author writes to entertain, inform, persuade, or express feelings.
Who was Alfred Wegener?
Was a german scientist.
Where is most new lithospheric plates created?
Divergent Plate Boundaries
Who is credited with coming up with continental drift?
(Alfred) Wegener
Describe the volcano types with at least 2 descriptions.
Fissure- giant crack in ground, no central crater, lots of lava
Cinder- bowl shaped, up to a thousand feet
Composite- tall, symmetrically shaped, above 10,000 ft
Shield- very big, broad with flat rounded shape
Describe all three plate boundary types and what might happen at each. (which way, natural hazards, what is created or destroyed)
divergent- moving away, earthquakes, volcanoes and mountains forming, litho formed
Convergent- moving towards each other, earthquakes, volcanoes and mountains forming, litho destroyed
Transform- moving past each other, earthquakes, no litho formed or destroyed.