four major layers of the earth

an english astronomer and mathematician, theorized that earth is hollow and that there are inner concentricblayers below the crust that float in gas.

outermost layer of earth

the lithosphere is composed of major and minor blocks called ___

the crust that makes up the continents is called ___

the interface between the crust and upper mantle

marks the boundary between the lower mantle and the outer core

it is located brtween the liquid outer core and the solid inner core.

croatian geophysict that studied the mohorovicic discontinuity

seismic waves are detected by highly sensitive instruments called ___

seismic waves are recorded by ___

two types of seismic waves

the waves that happens in the surface

waves that happens in the earth's interior

first waves to be felt on earth

also called transverse waves

earth began as a single landmass or supercontinent called ___

what does pan mean in greek?

what does panthalassa mean?

what does gaea mean in greek?

250 million years ago

200 million years ago

145 million years ago

65 million years ago

earliest theory on changing geography

autrian geologist, made analogy between wrinkles etc.

who proposed the theory of continental drift?

what is triassic small supercontinents?

give the four continents gondwana is composed of

give the three continents laurasia is composed of

american geologist, proposed the seafloor spreading theory

massive slabs of solid rocks

this movement is due to convection currents beneath the plate.

a professor and a geologist

how many major tectonic plates are there?

how many primary plates are there?

what are the 7 primary plates?

how many secondary plates are there? 

whst are some of the secondary platez?

either push tectonic plates toward one another or pull them apart. 

act against the driving forces of plate tectonics 

this boundary produces mid-oceanuc ridges

combination if strike-slip fault and dip-slip fault