Restless Earth Flashcards
Describe the features of a Destructive plate boundary
Plates move together
Continental and Oceanic crust
Volcano formed, Ocean Trench, Earthquake and Fold Mountain
Describe the features of a Constructive plate boundary
Plates move apart
Oceanic and Oceanic crust
New land is formed, earthquake
Describe the features of a Conservative plate boundary
Plates slide past each other
Continental and Continental crust
Earthquake
Give 2 differences between oceanic and continental crust
Oceanic Newer less than 200 million years Denser and can sink Continental Older more than 1500 million years Less dense and cannot sink
Define Anticline
Upfold of folded rock
Define Syncline
Downward fold of folded rock
Overfold
Rock fold that is folded over to one side
What plates do fold mountains occur at?
Destructive plate boundaries
State two differences between acidic and basic lava
Acidic High silica content Vicious and travels short distances before cooling Composite volcanoes Basic Low silica content Pours easily and travels far before cooling Shield volcano
What is the difference between lava and magma
Magma is underground and lava is on the surface of the earth
Give 3 factors of a composite volcano
- Acidic Lava
- Cone is tall with steep slope
- Irregular with long dormant periods
Give 3 factors of a shield volcano
- Basic Lava
- Cone has gentle slopes and wide base
- Regular frequent eruptions
What is the pacific ring of fire?
A destructive plate boundary around the pacific ocean where half of the volcanoes and earthquakes are
What is the subduction zone?
Where the oceanic plate subducts under the continental plate. This is where an oceanic trench is.
Give four uses of volcanoes
- Farming on fertile soils
- Tourist attractions (hot springs and walking)
- Geothermal energy
- Mining for valuable minerals eg Pumice