All about continental drift.
According to Wegener's hypothesis of continental drift,
a. the continents were once joined together in a single mass.
b. the contients do not move
c. Earth's surface is made up of seven major landmasses
d. Earth is slowly cooling and shrinking
A. the contients were once joined in a single landmass.
What technology did scientists use in the mid-1900s to map the mid-ocean ridge?
a. sonar
b. submarines
c. deep-sea diving
d. satellites
d. sonar
Most geologists think that the movement of Earth's plates is caused by
a. earthquakes
b. conduction
c. Earth's magnetic field
d. convection currents in mantle.
D. convection currents in the mantle.
A place where two plates slip past each other, moving in opposite directions is know as a
transform boundry
Any trace of an ancient organism that has been preserved in rock is called a
a. continent
b. fossil
c. landmass
d. landform
What is Pangaea?
The name of the supercontinent that existed millions of years ago.
In sea-floor spreading, molten material rises from the mantle and erupts
a. along the edges of all continents
b. along the mid-ocean ridges
c. in deep-ocean trenches
d. at then north and south poles
b. along the mid-ocean ridges
The geological theory that states pieces of Earth's lithosphere are in constant, slow motion is the theory of
a. sea-floor spreading
b. deep-ocean trenches
c. plate tectonics
a. subduction
c. plate tectonics
A collision between two pieces of continental crust at a converging boundary produces a
mountain range
Mid ocean ridges are
a. found only in the Pacific Ocean
b. found in all of Earth's oceans.
c. long deep-ocean trenches
d. located mostly along coastlines.
b. found in all of Earth's oceans.
Alfred Wegener provided evidence from landforms, fossils and climate in support of his theory of __________________________.
continental drift.
Old oceanic crust is more dense than new oceanic crust because it is
cool
The lithosphere is broken into sections called_____________, which float on top of the asthenosphere.
Plates
The place where two plates come together is knowns as a
convergent boundary
The process by which the ocean floor sinks beneath a deep-ocean trench and back into he mantle is know as _______________.
Subduction
The hypothesis of ________________(Not the man who came up with it) was that all continents were once joined as a single supercontinent and have since drifted apart.
Continental drift
How did scientists discover that rocks farther away from the mid-ocean ridge were older than those near it?
A. by measuring how fast sea-floor spreading occurs
b. by mapping rocks on the sea floor using sonar.
c. by observing eruptions of molten material on the sea floor
d. by determining the age of rock samples obtained by the drilling on the sea floor.
d. by determining the age of rock samples obtained by the drilling on the sea floor.
The formation of volcanoes and mountain ranges can be explained by the theory of
Plate tectonics
When continental plates pull apart at a divergent boundary on land, a(n) _____________ forms.
rift valley
True or False for CAPITILIZED word.
Oceanic crust near the mid-ocean ridge YOUNGER than oceanic crust farther away from the ridge.
If false, what is the correct word?
Wegener believed that the continents had once been joined in one landmass called
Pangaea
The process by which the ocean floor sinks beneath a deep-ocean trench and back into the mantle is known as
Subduction
What are the three boundaries with plate tectonics that causes earthquakes, rift valley and mountains.
Transform boundary, convergent boundary. and divergent boundary.
A continental plate collides with an ocean plate at a(n) __________________ boundary.
convergent
Subduction occurs where the oceanic crust bends down toward the mantle at a(n) _____________________.
deep-ocean trench