Earth's Interior
a force that builds up the features of Earth's surface
constructive force
a. density increases
b. density decreases
c. density doesn't change
b. density decreases
All the continents were once joined together in a supercontinent called __________.
Pangaea
Breaks in the Earth's crust where rocks have slipped past each other are called:
a. cracks
b. boundaries
c. faults
d. rifts
c. faults
How long do cubs typically stay with their mothers?
2-3 summers (so 2.5-3.5 years)
basalt
Which type of heat transfer drives currents in Earth's mantle?
a. radiation
b. asthenosphere
c. conduction
d. convection
Why did scientists reject Wegener's theory of continental drift?
Because he could not explain how the continents actually moved.
Use your plate blocks to demonstrate converging continental plates. Describe what forms in this situation.
push the two side blocks together to lift up the center, creating a mountain
Name the US state and the national park where the bears of Fat Bear Week live
Katmai National Park, Alaska
The crust and the uppermost part of the mantle together form a rigid layer called the ________.
lithosphere
The transfer of heat through empty space is
a. conduction
b. convection
c. radiation
d. heat transfer
c. radiation
How did Wegener use evidence based on fossils to support his theory that the continents had moved?
He found fossils from leaves of a plant in most continents, however its seeds could not have been carried by wind or waves. He also found some animal fossils on continents that were too far apart for the animal to swim to.
Which layer of Earth do tectonic plates move on (which layer "flows")?
A. Lithosphere
B. Outer core
C. Asthenosphere
D. Crust
c. Asthenosphere
How did Gully get his name?
From his unusual behavior of eating birds (including sea gulls)
What are the main layers of the Earth's interior?
crust, mantle, core
Which is an example of conduction?
a. sunlight warming the Earth's surface
b. heating a pot of soup on the stove
c. magma heating from Earth's core
d. a hot roasting stick in a campfire
d. a hot roasting stick in a campfire
In sea-floor spreading, molten material forms new rock along the _____________, pushing ___________ to both sides of the ridge.
mid-ocean ridge, older rock
What happens at a divergent plate boundary?
A. Two plates move toward each other
B. Two plates move apart
C. Two plates slide past each other
D. One plate stops moving
B. Two plates move apart
Who is bear 806's adopted cub?
Biggie, daughter of Grazer
What makes up the inner core of Earth?
solid iron and nickel
Which process drives convection currents in Earth's mantle?
a. cold, dense rock rising toward the crust
b. core heat warming rock, making it less dense and causing it to rise
c. magma sinking at the Earth's core
d. magnetic forces pulling tectonic plates downward
b. core heat warming rock, making it less dense and causing it to rise
In the process of ___________, oceanic crust sinks down beneath a deep-ocean trench back into the ________.
subduction, mantle
What happens at a convergent boundary of two oceanic plates?
One subducts under the other, creates a deep ocean trench, and sometimes volcanic activity (can create a volcanic island chain)
Name three challenges that brown bears face
1. Finding enough food
2. gaining enough weight to get through hibernation
3. competition with other bears for food or mates
4. raising cubs in a harsh environment (adult females)
5. Climate change reducing where they live and what they eat
6. Human conflicts