Definitions Flashcards
Magnetic North
North that magnets point to
True North
furthermost point north on Earth
North & North pole
South & South pole
Like poles - repel
North & South pole
unlike poles - attract
Directional properties of magnets
North will always point north
Magnetic field
space around the magnet in which magnetic forces act.
attractive force of a magnet
Magnets attract objects made of iron, steel, cobalt, nickel
Pangaea
all earth (world one big continent)
Continental Drift
theory where all continents were all joined up and are now separate.
convection currents
hot liquid rises, cold liquid sinks
Faulting
the cracking of rocks
palaeontologists
scientist that digs up fossils
body fossils
where there is actually some portion of the fossil remaining (bones, teeth)
trace fossils
no portion of actual fossil but traces (molds,animal tracks,impressions)
Metamorphic rocks
made with great heat and pressure
igneous rocks
spewed out from volcanoes, cooled down lava
sedimentary rocks
sediment layes building up
mohs hardness scale
classify rocks by how hard they are
weathering
breaks down rocks
erosion
moves rocks & soil away
physical weathering
breaks down rocks physical structure
chemical weathering
breaks down rocks chemical structure (make rocks more brittle & soft)
revolution
earth orbits sun
rotation
moon orbits earth
phases of the moon
The moon looks like it is changing shape
20 July 1969
day man 1st walked on the moon
