Which of these is part of the lithosphere?
all of the mantle
crust and outer part of the mantle
Which part of the mantle is still a solid but flows like a thick, heavy liquid?
Seismic waves travel at different speeds according to type. What is the speed of seismic waves from fastest to slowest?
S waves, L waves, P waves
P waves, S waves, L waves
L waves, S waves, P waves
P waves, L waves, S waves
What is the best description of the paths of S waves and P waves?
S waves travel through solids, liquids, and gasses. P waves travel through solids or very dense, glassy liquids.
S waves travel along the surface of Earth's crust. P waves travel through Earth's interior.
S waves travel through Earth's interior. P waves travel along the surface of Earth's crust.
S waves travel through solids or very dense, glassy liquids. P waves travel through solids, liquids, and gasses.
What is the exact location of an earthquake on Earth's surface?
What evidence did Wegener make use of to develop the theory of continental drift?
Mountains in North America appear to be part of the same chain of mountains as those in Northern Europe.
The climate of Siberia has always been the same.
The Rocky Mountains are taller than the Appalachian Mountains.
There is no evidence of glaciers anywhere in South America.
C, B, A
C, A, B
A, B, C
The theory of continental drift proposes that the Earth's continents may have once been united as a supercontinent but have drifted apart over time. What was the name of the supercontinent?
Over time the original supercontinent broke into two large land masses. What are the names of these two land masses?
Laurasia and Pangaea
Laurasia and Gondwanaland
Gondwanaland and Pangaea
Pangaea and Eurasia
Over time Pangaea broke apart to form other continents. Which modern day continents composed Laurasia?
North America, Europe, and most of Asia
North America and South America
Africa, South America, Antarctica, Australia, and the subcontinent of India
Antarctica, South America, and Europe
Which term is described as a flat expanse of ocean floor?
Which term is described as a seamount with a flattened top?
Where are the youngest rocks in the Earth’s crust found?
along the continental slope
in the center of the continents
at the center of the mid-ocean ridge
Iron-rich minerals in rock pointed in one direction and then switched to the exact opposite direction. This supports what idea?
The rocks were being turned around.
Earth’s magnetic field stopped working entirely.
Earth’s magnetic field goes through pole reversals.
Being underwater makes the rocks respond to magnetic fields.
How does the ocean floor keep track of magnetic fields?
There are magnets in the ocean floor
All rocks act like magnets
Basalt is iron-rich and responds to magnetic fields
Which of these pieces of evidence did Alfred Wegener's original theory of continental drift have access to?
seafloor spreading at mid-ocean ridges
reversing paleomagnetism in rocks on the ocean floor
evidence of ancient tropical swamps in cold regions of North America
a seafloor that was geologically active with earthquakes, volcanoes, and mountain chains
Which theory best explains the present arrangement of continents, oceans, and landforms on Earth?
plate tectonic theory
Wegener's continental theory
The continental puzzle theory
the Pangaea theory
Which description best presents the arrangement of continents, oceans, and landforms according to the theory of plate tectonics?
several divisions of two original continents over millions of years
the motion of lithospheric plates over millions of years
oceans eroding along different paths within a single continent over millions of years, causing it to break up
Which two forces do scientists believe are responsible for tectonic plate motion?
gravity acting on the edges of plates and friction between the plate and the asthenosphere
friction between the plate and the asthenosphere and pressure of magma on the edge of the plate
gravity acting on the edges of plates and convection in the mantle
convection in the mantle and pressure of magma on the edge of the plate
Which of these statements is true about the theory of plate tectonics and the theory of continental drift?
The theory of plate tectonics explains how continental movements could occur.
The theory of plate tectonics shows that continental movements could not have happened.
The theory of plate tectonics tells exactly where the continents were before Pangaea divided.
The theory of plate tectonics shows that Pangaea was impossible, but the continents did move.
What activates a convection current, starting the flow of a fluid?
heated liquids at Earth’s surface
iron-rich rocks in the mantle
temperature differences in the mantle
Which of the following is a result of gravity in relation to moving tectonic plates?
Earth's magnetic field reverses
ridge push and slab pull
circulating material in the mantle
Earth's internal heating
How can gravity's role in tectonic plate motion be described?
Which two processess do scientists think move the Earth's lithospheric plates?
At what location does gravity play a role in moving tectonic plates?
in the mantle
in the middle of a continent
at the edge of the plates
in the core
Continental crust is more dense and contains a lot of basalt.
Continental crust is thinner and younger.
Oceanic crust is thinner and younger.
Oceanic crust is thicker and contains a lot of granite.
Look at this section of a tectonic map. Describe what is happening at the plate boundary.
An oceanic plate is subducting.
Two continental plates are colliding.
Two plates are sliding past each other.
Mountains form as lithospheric plates move side by side past each other.
Collisions occur as lithospheric plates move toward each other.
Magnetism occurs as lithospheric plates are attracted toward each other by gravity.
Earthquakes occur as lithospheric plates move away from each other.
They push against each other to form deep-ocean trenches.
One slides under the other to form new mantle.
They push against each other to form folded mountain ranges.
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