planet earth questions
what are the eras
precambrian
paleozoic
mesozoic
cenozoic
how are crystals made
particles in a mineral line up in a regular pattern
why was wageners theory not accepted
Geologists thought the earth was shrinking
He couldnt prove a way how the continents where moving
3 families of rock
sedimentary
metamorphic
igneous
6 properties to identifie a mineral
colour lustre
streak cleavage
fracture hardness
how to find epicentre
where 3 seismograms meet
evidence for the theory of the sea floor moving
mid atlantic ridge
3 types of weathering
mechanical
chemical
biological
how a valcona begins and ends
molten rock expands. As it expands it moves upwards. Lava shotts out in the air. Or flows from the vent and flows down the sides
difference between folds and faults in mountains
folds- bend in rock layers
faults - large cracks
4 peices of evidence proving the theory of pangea
-fossil corelation
-mountain and rock corelation
-paleo climate data
-coal deposits
theory of plate tetonics
the lithosphere is broken up into areas called plated that bith carry continental crust and oceanic crust