Vocabulary
The thinnest layer of the Earth
The crust
There are ______________ main layers of the Earth.
Four
Who created the Continental Drift Theory
Alfred Wegener
Earthquakes and Volcanoes are usually located in relation to these
Convergent plate boundary
The Himalayan mountains are the result of a ___________________________ boundary.
Convergent boundary
A number of rigid, but moving, pieces of Earth's surface
Tectonic plates.
The thickest layer of the Earth
Mantle.
What are 2 reasons Why the scientific community reject Alfred Wagner ideas
The mid-ocean ridge is an example of a ____________________ boundary and ___________________ occurs here where new ocean floor is formed.
Divergent boundary; Sea-floor spreading
Hot air or liquid is less ________________ than cool air or liquide
Dense
The theory that all continents are fragments of Pangaea now drifting apart
Continental Drift Theory
Plates float on top of the _______________________.
Asthenosphere
What was the name of the super continent
Pangaea
Name four of the major plates
North American plate, South American plate, Eurasian Plate, Indoaustralia plate, African plate, Antarctica plate, Pacific plate, Nazca plate
_________________ are a result from the build up of stress at a plate boundary.
Earthquakes
States that youngest rocks of ocean floor are at divergent boundaries, moving outward
Seafloor spreading
The rigid part of the Earth including the crust and the upper mantle (makes up the plates of the Earth)
Lithosphere
Pangaea existed this many millions of years ago
1. 65 million
2. 250 million
3.170 million
250 million years ago
This is the mechanism (what causes) the plates to move
Convection currents in the mantle
The San Andreas Fault in California is an example of a ____________________ boundary.
Transform boundary
Although the hottest layer of the Earth, this layer is solid metal
The inner core
The Earth's crust is thinnest under the _____________________ and thickest under the _____________________.
Thinnest under the ocean and thickest under the continents.
Continental Drift Theory was not accepted because it did not explain this
How the continents moved (Mechanism)
What major geological event occurs at convergent boundaries
Subduction and volcanoes
List the 5 evidences of continental drift
Fossil and plants matched, fossils did not match the climate, the continents matched, the glacial marks matched, the rocks matched