A large supercontinent
Pangea
What did Alfred Wegener do?
Came up with the theory of continental drift
What evidence did Wegener use for continental drift?
1. evidence from landforms
2. evidence from fossils
3. evidence from climate
1.
Name the 3 types of plate boundaries
2.
3.
convergent – plates come together
divergent – plates move apart
transform – 2 plates slide past each
other
What causes the movement of the earth’s plates?
Convection currents in the earth’s mantle.
How does a convection current work?
Warm air or liquid rises (less dense) and then it
cools (becomes more dense) and it sinks – this
creates a circle
Describe sea-floor spreading.
Magma comes to the surface at the mid-ocean
ridge and forms new crust
The new crust will be in the middle/toward the edge of
the ocean.
Middle
What happens at the subduction zones and where are
they located?
Where is the longest chain of mountains in the world?
What occurs at divergent plates on land?
What is a deep-ocean trench and what happens there?
Crust is pushed back into the mantle (it melts back
into magma). Subduction zones are located along
2 plate boundaries.
Located along the mid-ocean ridge and the
mountains are under water.
Rift valley
A deep-ocean trench is an area where subduction
occurs taking the ocean floor back into the mantle
Ocean crust is made mainly of what rock?
basalt
Continental crust is made mainly of what rock?
Granite
What are the layers of the earth?
Crust, mantle, inner core and the outer core.
Earth’s magnetic field is created by?
Convection currents in the liquid outer core.
Describe the water cycle.
What is land subsidence?
Water moves from the oceans to the atmosphere,
to the land surface and returns to the oceans.
Water undergoes evaporation, condensation and
precipitation.
Ground water is removed and the land sinks
What causes the earth’s seasons?
Name the 3 climate temperatures zones and be able to
locate them on a map.
The tilt of the earth’s axis.
1.
2.
3.
polar zones
temperate zones
tropical zone
The main factors that affect precipitation are:
1.
2.
The 4 factors that influence temperature of a region
are:
1.
2.
3.
4.
prevailing winds and
the presence of mountains.
latitude
altitude
distance from large bodies of water
ocean currents
Directions for making flashcards – fold each sheet in
½ ‘hot dog’ style’ (writing should be on the outside
of the cards) – glue or tape – cut on lines. Italicized
side is the questions and the bold side is the answers