Vocabulary
The thinnest layer of the Earth
What is the crust
There are ______________ main layers of the Earth.
What is three
Created the Continental Drift Theory
Who is Alfred Wegener
Earthquakes and Volcanoes are usually located in relation to these
What is a plate boundary
The Himalayan mountains are the result of a ___________________________ boundary.
What is convergent boundary
A number of rigid, but moving, pieces of Earth's surface
What is tectonic plates.
The thickest layer of the Earth
What is the mantle.
The theory that all continents are fragments of Pangaea now drifting apart
What is the continental drift
The mid-ocean ridge is an example of a ____________________ boundary.
What is divergent boundary
Hot air or liquid is less ________________ than cool air or liquid
What is dense
_________ occurs when two tectonic plates collide and force the more dense plate under the less dense plate
What is subduction
Plates float on top of the _______________________.
What is the lithosphere
Evidence of tropical plants were found on this continent
What is Antarctica
Name the 3 major boundaries
_________________ are a result from the build up of stress at a plate boundary.
What is earthquakes
States that youngest rocks of ocean floor are at divergent boundaries, moving outward
What is seafloor spreading
The rigid part of the Earth including the crust and the upper mantle (makes up the plates of the Earth)
What is the lithosphere
Pangaea was the supercontinent that means
What is all lands
This is the mechanism (what causes) the plates to move
What is convection cycles in the mantle
Deep valleys on the seafloor are called
What are trenches
Although the hottest layer of the Earth, this layer is solid metal
What is the inner core
The Earth's crust is thinnest under the _____________________ crust and thickest under the _____________________ crust.
What is thinnest under the ocean and thickest under the continents.
Continental Drift Theory was not accepted because it did not explain this
What is how the continents moved
The two types of convergent boundaries
What is subduction (where volcanoes often occur) and collision (where mountains are usually formed)
This persons maps helped prove the continental drift was real
Who is Marie Tharp "Girl Talk"