How can we help?

You can also find more resources in our Help Center.

27 terms

Science Quiz-April 5

STUDY
PLAY
Aflred Wegner
_____proposed theory of continental drift in 1912
Pangaea
super-continent name
Puzzle
One piece of evidence that supports Wegner, all continents look like they fit together like a ________
Fossils
Evidence 2-different continents have the same_____from plants and animals
scrapings
rocks from different continents have the same glacial_____
composition, age
rocks on different continents are similar in ____, ______
rotation
possible explanation by Wegner was Earth's ________
Weather man
occupation of Wegner
sonar
mid-atlantic ridge was discovered by mistake using______
Harry Hess
proposed theory of seafloor spreading in '60s
continental drift
theory that all continents were once connected but have drifted apart
seafloor spreading
theory that hot, less dense material below crust rises to surface at ridge; then flowing sideways carrying sea in both directions
Youngest, oldest
_________ rocks are closest to ridge, _________ are furthest away(age, age)
Magnetic clues
manetic field change ( reversal is recorded in rocks around ridge)
Iceland
ridge splits this country in 1/2
plate tectonics
combines continental drift and seafloor spreading , crust is broken up into plates move on plastic layer of astenosphere
Divergent
Plates move apart
convergent
plates move together
transform
plates slide past
convection currents
cause magma to rise and cool at surface, causing a current that moves plates
Earthquakes
occur at all boundaries
Tsunamis
Underwater EQs
Volcanos
occur at subduction zones, divergent underwater
Mountains
form at convergent boundaries
Deep sea trenches
form at convergent and push down into mantle
Rift valley
occur when plates pull apart
Oceanic Crust
type of crust that that is more dense than continental