Ch 19

Wegener’s continental drift hypothesis stated that all the continents once joined together to form…
A single continen
the supercontinent in the continental drift hypothesis was called…
peagaea, meaning all land
One kind of evidence that support wegener’s hypothesis is that…
according to the theory of plate tectonics, the uppermost mantle, along with overlying crust, behave as a strong, rigid layer…
the layer is known as the lithosphere
in the plate tectonic theory, a plate can be made up of…
what kind of boundary occurs who two plates grind past each other without destroying or producing lithosphere…
(slide side by side each other) transform fault boundaries
what type of boundary occurs when two plates move together, causing one plate to descend into the mantle beneath the other plate?
convergent boundary
new ocean crust form at…
divergent boundaries
what hypothesis states that the continents were once joined to form a single supercontinent?
continental drift theory
which of the following was NOT used in support of the continental drift hypothesis>
in the plates tectonic theory, the lithosphere is divided into…
A tectonic plate consist of…
uppermost mantle, along with overlying crust
which of the following is a geographic example of a transform fault boundary?
San Andreas Fault
which of the following results when divergence occurs between two oceanic plates?
divergence creates new seafloor. divergence causes ocean ridges and raft valley
the Himalayas in South Asia are an example of what type of plate of boundary?
convergent boundary and result of continental-continental collisions.
volcanic island arcs are
result of convergent boundary
according to the property of palemagnetism what happened
rock formed millions of years ago thus show the location of the magnetic poles at the time of their formation
how does the age of a seafloor sediments change with increasing distance from the ridge?
when the oldest sediment from each drill site was plotted against it’s distance from the ridge crest, it was revealed that the age of the sediment increased with increasing distance from the ridge.
the thermal convection that drives plate motion is caused by
unequal distribution earth’s heat
define each one
divergent- also called spreading center occurs when two plates moves on apart. this process results in upwelling of materials from the mantle to create new seafloor.
hot spots- concentration of heat in the mantle capable of producing magma , which rises to earth’s surface. the pacific plate moves over a hot spot,producing the Hawaiian island.
lithosphere-rigid outer layer of earth ,including the crust an upper mantle
Pangaea- the proposed Super continent that 200 MY began break apart an form the present landmasses
One kind of evidence that support wegener’s hypothesis is that…
what are the three main types of plates boundaries
convergent,divergant, transform fault boundary
list the lines of evidence that supports the theory of plates tectonics
paleomagnetism, earthquake pattern, ocean drilling hot spots.