Rocks
What type of rock is formed in layers?
a. metamorphic. b. sedimentary
c. igneous e. rock lava
Sedimentary
Igenous rock is made from?
lava / magma
What theory did Alfred Wegener propose?
Continental Drift
What are the layers of the earth?
Crust, mantle, outer core, inner core
The mid ocean ridge occurs along a .....
Divergent boundary where sea-floor spreading takes places. Creates new earth crust.
What type of rock has small crystals?
a. extrusive igneous b. intrusive igneous
c. metamorphic e. clay
extrusive igneous
Metamorphic rock means rock that has?
Changed through heat and pressure
The circulation of hot mantle under the crust, caused by differences in temperature and density cause what?
Convection Current - cause the plates to move
Sediments are created from igneous, metamorphic and sedimentary rocks by ______and ________
weathering and erosion
Hot parts of the mantle rises through thin parts of the crust (middle of plate) causing.....
HOT SPOTS
Magma released from the ground is called what on the earths surface?
Lava
Slow cooling of magma leads to what sized crystals?
LARGE crystals
The theory of one super continent is called?
Pangea
What causes earthquakes?
Tectonic plates moving in TRANSFORM motion.
Name three problems caused by open pit mining?
Disturbs the land. Pollutes the air. Causes industrial waste
The process of breaking down rocks is called?
weathering
Name 3 types of properties, used to describe minerals?
Hardness, streak, colour, lustre, clevage, opaque, light
Two continents colliding is an example of ____________ and will create __________
Convergent Boundary, create mountains
Volcanoes will most likely occur along which type of boundary? What is a major ring of volcanoes called?
Convergent boundary. The Ring Of Fire.
What is the relationship between plate movements and convection currents?
Hot mantle moves in circular motion (currents), pulls the plates apart, creating a ridge. Lava fills this gap underwater and cools. Called sea-floor spreading.
Deposition means?
dropping off sediment
Compaction is used to form with type of rock?
Sedimentary
This type of boundary creates valleys and rifts
Divergent boundary
Subduction is when....
One plate slides under another due to difference in density and thickness.
What forms the black sand beaches of Hawaii?
Shattered lava