GEOGRAPHY🌳 Flashcards
(76 cards)
Who is Alfred Wegener?
The man who came up with the theory of Pangaea.
Name the four layers of the earth,
crust, mantle, outer core, inner core
What moves tectonic plates?
convection currents
Describe the continental crust.
thicker, less dense and older
Describe oceanic crust
thinner, younger and more dense
Name a subduction zone
The South American plate, and the Nazca Plate
What happens at a destructive boundary, in terms of features?
Earthquake, composite volcanoes
Describe composite volcanoes
large and steep, viscous lava, less frequent eruptions.
Describe shield volcanoes
gentle sides, gentle and more frequent eruptions, less viscous lava
Name the different plate boundaries
Constructive, conservative, destructive, collison
What is an example of a conservative plate boundary?
San Andreas fault.
Can volcanoes occur at conservative plate boundaries?
No, but earthquakes can.
Name a constructive plate boundary
Mid-Atlantic Ridge
What are characteristics of divergent plate boundaries.
Volcanoes, shield volcanoes, earthquakes, rising land.
What is a collision plate boundary?
two continental plate boundaries push towards each other. They form mountains. They are the same type.
What is an example of a collision plate boundary?
Himalayas
Why are composite volcanoes so viscous?
The melting of oceanic rock and gases, high in silica.
What are the bounds of the Richter scale?
1 to 10, and is logarithmic
What is the difference between the Richter and Mercalli scale?
Richter measures magnitude, Mercalli measures impact on life and damage.
What is the difference between the focus and epicentre?
Focus is underground, epicentre is above.
What is the difference between primary and secondary waves?
Secondary waves are more violent, due to them being after the primary waves, but are slower and can only move through rock.
Primary waves move faster, in a push pull direction and all solids.
What was the magnitude of the 2010 Haiti earthquake?
7
What made the Haiti earthquake a human disaster, in regards to the day?
The day was Wednesday, near 5pm, work, very shallow at 9km, only 15km from capital
Name five factors that made the Haiti earthquake worse.
- Population density
- Living conditions; gdp per capita of $650
- Buildings not built to seismic design code.
- Corruption.
- Half the people earn under 85p per day.