The Himalayan mountains are the result of a ___________________________ boundary.
What is a convergent boundary.
100
Earthquakes and Volcanoes are usually located in relation to these
What is a plate boundary.
100
There are ______________ main layers of the Earth.
What is four.
200
A number of rigid, but moving, pieces of Earth's surface
What is plate tectonics.
200
Continental Drift Theory was not accepted because it did not explain what?
What is how the continents moved.
200
Hot air or liquid is less ________________ than cool air or liquid.
What is dense.
200
The mid-ocean ridge is an example of a ____________________ boundary and ___________________ occurs here where new ocean floor is formed.
What is divergent boundary; sea-floor spreading
200
The thickest layer of the Earth
What is the mantle.
300
The theory that all continents are fragments of Pangaea now drifting apart
What is the Continental Drift theory.
300
Evidence of tropical plants were found on what continent?
What is Antarctica
300
_________________ are a result from the build up of stress at a plate boundary.
What is earthquakes.
300
Name four of the major plates.
What is any of the following North American plate, South American plate, Eurasian Plate, Indoaustralia plate, African plate, Antarctica plate
300
Plates float on top of the _______________________.
What is the asthenosphere.
400
The theory that all continents are fragments of Pangaea now drifting apart.
What is seafloor spreading.
400
Evidence of matching animal fossils were found from two separate continents called...
What is South America and Africa.
400
The San Andreas Fault in California is an example of a ____________________ boundary.
What is a transform.
400
This is the mechanism (what causes) the plates to move
What is convection cycles.
400
The rigid part of the Earth including the crust and the upper mantle.
What is the lithosphere.
500
The hottest layer of the Earth.
What is the inner core.
500
Pangaea existed this many millions of years ago...
What is around 250 million years ago.
500
Name what happens at each of the boundarys:
Constructive-
Destructive-
Conservative-
What is constructive is where new crust is built, destuctive is where old crust is destroyed, and conservative is where crust is neither created or destroyed.
500
The two types of convergent boundaries.
What is subduction (where volcanoes often occur) and collision (where mountains are usually formed)
500
The Earth's crust is thinnest under the _____________________ and thickest under the _____________________.
What is thinnest under the ocean and thickest under the continents.