Chapter 5 science review
Terms in this set (60)
is Earth's crust solid or is it broken up like an eggshell
who was the first person to propose the theory of continental drift
what year did Wegener propose the idea of continental drift
what was the continent called 300 million years ago
the continental drift theory
what was the idea that there was once a huge supercontinent and has since drifted apart
because the continents looked like they fit together
why did Wegener propose the idea of continental drift
any trace of an ancient organism that has been preserved in rock
evidence of fossils
same fossils found in different continents
evidence of rocks
same rock patterns found in south America, India, Africa, Antarctica and Australia
evidence of ancient climate
tropical plant fossils in Antarctica and glaciers in Africa, south America, India, and Australia during the same time
problems with theory
no mechanism for movements of continents, wind and currents could move fossils, theory was not accepted
in a blizzard
how did Alfred Wegener die
drew maps of the ocean floor based on data and sonars
helped Mari Tharp
outcome of sea floor spreading
it adds more crust to the ocean floor
evidence of sea floor spreading
tubeworms, sonars, old rock on outside new rock near the middle, molten material, magnetic stripes, drilling samples, and subduction
the evidence of sea floor spreading that shows how certain worms use Bactria inside the magma vents to survive
evidence of sea floor spreading where they used a device to bounce waves off the ground and back.
mid ocean ridges
mountain ranges that form in the ocean where a divergent boundary is.
mid ocean ridges are the longest mountain ranges in the world?
evidence that shows how sea floor spreading is like a conveyer belt
evidence of sea floor spreading that shows that new crust is being added by magma.
stripes that hold a record of the reversals in Earth's magnetic field
Core samples from the ocean floor show that older rocks are found farther from the ridge; youngest rocks are in the center of the ridge
Process by which the ocean floor sinks beneath a deep ocean trench and back into the mantle; allows part of the ocean floor to sink back into the mantle
Puerto Rico trench
larges trench in the Atlantic ocean
deep ocean trench
Occurs at subduction zones. Deep underwater canyons form where oceanic crust bends downward
Canadian scientist that discovered cracks in continents sillier to those in ocean floors. Proposed that lithosphere is broken up into plates
theory of plate tectonics
combination of plates, sea floor spreading, and continental drift into one theory.
convection currents in the mantle
how do Earth's plates move
affects of plates
volcanoes, mountain ranges, deep sea trenches.
where two plates move apart.
when two plates slip past each other.
divergent boundaries create
mid ocean ridges and rift valleys. causes sea floor spreading
transform boundaries create
when two plates collide
convergent boundaries create
mountain ranges and volcanoes.
subduction occurs, forms mountains or volcanos
oceanic sinks, subduction occurs, trenches form
mountain ranges are created
tsunamis or volcanoes
earthquakes or volcanoes
sea floor speeding. mid ocean ridge
how many centimeters a year do continents move
Wegener's idea that continents moved over Earth's surface
sea floor spreading
a process where new material is constantly added to Earth's crust
deep ocean trenches
underwater canyons where subduction occurs
pieces of the lithosphere that are broken up
where two plate boundaries meet
where pieces of Earth's crust diverge on land, a deep valley
A GEOLOGIST WHO STUDIED THE OCEAN FLOOR USING SONAR TO PROVE THE SEAFLOOR WAS SPREADING.
the stage of Pangaea 250 million years ago.
the stage of Pangaea 145 million years ago.
the stage of Pangaea 65 million years ago.
the stage of Pangaea 200 million years ago.
the stage of Pangaea when India collided with Eurasia.
which stage of Pangaea cased mass extinction
magnetic stripes reverse every...