JDMcDsblog

Words are listed in order of appearance, with the most recent at the top-that way your eye is drawn to the latest word to be introduced to a lesson. But, don’t forget the older words at the foot of the list.

S2

Unit 2 Global Studies

precipitation:- any moisture from the air, usually rain, but also snow, hail, fog, mist, dew

mushroom rock-rock found in desert, much narrower at base than top (often look top heavy)

wadi- steep sided dry valley

barkhan-crescent shaped sand dune

Unit 1-Earth Movements

List updated 27th October:

focus: point within the crust where pressure is released. May be several km below the surface.

epicentre; point on Earth’s surface, above the focus; often the area most severely damaged

seismic waves: shock waves which spread out from the focus,through the crust and the Earth’s surface

after shock smaller, less powerful waves that come after the main ‘quake

seismometer: very sensitive instrument that detects seismic waves

Richter Scale: scale from 0 to 10 that measures the power, or magnitude, of an earthquake

fossil   see http://www.bbc.co.uk/sn/prehistoric_life/dinosaurs/making_fossils/- http://www.open2.net/fossildetectives/index.html   

• Mesosaur:  freshwater reptile, long extinct, fossils found in South America and Africa. helped support the idea of continental drift.

Pangea     large, supercontinent that existed 250 million years ago. It then split up.

• Laurasia       large continent formed by break up of Pangaea-included modern day America
• Gondwana    large continent formed by break up of Pangaea-included modern day Africa

core

• inner core
• outer core

mantle

• mantle
• convection currents

crust:

• continental crust
• oceanic crust

Constructive margin-zone of spreading plates, ie two oceanic plates moving apart; new oceanic crust  is formed as magma rises to the surface

destructive margin: zone of colliding plates: where one plate is dragged under another one.