restless earth Flashcards
give 3 features of continental crust
- light
- less dense
- neither created nor destroyed
- floats on the mantle
- very old
what landforms can be created on a constructive plate boundary?
- composite volcanoes
- volcanic islands
- mid ocean ridge
- (gentle earthquake)
what is a constructive plate boundary?
where two oceanic plates move apart from each other
name 1 enable of a constructive plate boundary
North American and eurasian plate
name the landforms created at a destructive plate boundary
- shield volcanoes
- deep ocean trench
- fold mountains
what is a destructive plate boundary
where the more dense plate sinks into the mantle and forms a shield volcano and deep ocean trench
what is a conservative plate boundary
where two plates moves along side each other either different directions or speeds
what landforms are created at conservative plate boundaries
NONE only earthquakes
what is a collision plate boundary
where two continental plates bash into each other forming fold mountains and severe earthquakes
what plate boundaries are fold mountains found
destructive, e.g Eurasian and Indian plate
collision, e.g South American and max a plate
give 3 features of oceanic crust
- heavy
- more dense
- can be created and destroyed
- very young
- can sink into the mantle
name 4 characteristics of a composite volcano
- gently sloping slides
- wide base
- slow flowing lava
- regular and frequent eruptions
name 4 characteristics of a shield volcano
- tall cone with steep sides
- narrow base
- fast flowing lava
- irregular and long dormant periods
how are seismic waves measured?
using the Richter scale which measures the magnitude of the earthquake
