ALAN
The solid centre of the Earth.
What is the inner core?
According to continental drift theory, all the continents were once __________.
What is joined together (one large landmass)?
Hundreds of years ago, people first thought that the continents may have been joined together at one time based on maps showing their _______.
What are shapes?
The name Alfred Wegener gave his super-continent.
What is Pangaea?
Rising up from the mantle, this flowing liquid is one of the main driving forces which causes plates to move.
What is magma?
The liquid layer inside the Earth.
What is the outer core?
The thin layer of rock surrounding the Earth.
What is the crust?
The solid centre of the Earth.
What is the inner core?
The only Earth layer that is liquid.
What is the outer core?
The layer of Earth with two sections, a solid upper part, and a partially molten lower part.
What is the mantle?
A giant super continent.
What is Pangaea?
The ocean floor moves apart here.
What is sea floor spreading?
At places like the Juan de Fuca Ridge off the coast of Vancouver Island, huge slabs of Earth's crust are moving _____________.
What is apart (away, opposite direction)?
The super-continent, Pangaea, began breaking apart approximately __________ million years ago.
What is 200?
While the Earth's surface is solid, it is broken up into these large pieces of rock.
What are tectonic plates?
Earth's layer that forms part of tectonic plates.
What is the crust?
This is a deep valley in the ocean floor.
What is a trench?
The theory that all the continents formed where they are now located was referred to as _______.
What is fixism.
Deep underwater valleys formed at converging plate boundaries.
What are trenches?
What is rock (lithosphere, plates)?
This came after Alfred Wegener's theory.
What is the theory of plate tectonics?
Pangaea was a major part of this theory.
What is continental drift theory?
_________ under the ocean form long, high mountain ranges, which are similar to mountain ranges on the continents.
What are Mid-Ocean Ridges (Ridges)?
_______ on land form the same way as ridges under the ocean.
What are rifts?
What is indirect (earthquake)?