Along which features does seafloor spreading occur?(1 point)
Responses
ocean basins
ocean basins
ocean trenches
ocean trenches
fault lines
fault lines
mid-ocean ridges
15 answers
mid-ocean ridges
Why is no land created or destroyed at transform boundaries?(1 point)
Responses
because magma rushes into gaps at these boundaries
because magma rushes into gaps at these boundaries
because the plates only slip past each other at these boundaries
because the plates only slip past each other at these boundaries
because the plates are more dense at these boundaries
because the plates are more dense at these boundaries
because the plates crumble into each other at these boundaries
Responses
because magma rushes into gaps at these boundaries
because magma rushes into gaps at these boundaries
because the plates only slip past each other at these boundaries
because the plates only slip past each other at these boundaries
because the plates are more dense at these boundaries
because the plates are more dense at these boundaries
because the plates crumble into each other at these boundaries
because the plates only slip past each other at these boundaries
Iron particles in basalt on the ocean floor tell scientists [the direction of the magnetic field / the direction the plate is moving]. In two adjacent magnetic stripes, the iron particles show [different / the same] alignments.
Iron particles in basalt on the ocean floor tell scientists the direction of the magnetic field. In two adjacent magnetic stripes, the iron particles show different alignments.
Which statement identifies a major reason for the subduction that helps to form volcanoes?(1 point)
Responses
the upwelling of magma between diverging plates
the upwelling of magma between diverging plates
the release of hot ash and steam in a pyroclastic flow
the release of hot ash and steam in a pyroclastic flow
the difference in density of oceanic and continental plates
the difference in density of oceanic and continental plates
the unusually high temperature at hotspots
Responses
the upwelling of magma between diverging plates
the upwelling of magma between diverging plates
the release of hot ash and steam in a pyroclastic flow
the release of hot ash and steam in a pyroclastic flow
the difference in density of oceanic and continental plates
the difference in density of oceanic and continental plates
the unusually high temperature at hotspots
the difference in density of oceanic and continental plates
In trying to prove continental drift, Alfred Wegener used evidence from long ago to show that in the distant past, similar animal species lived in places that are [seperated by great distances / no longer in existence / now underwater / on different tectonic plates] today. For example, fossils of the [Mesosaurus / Lystrosaurus / Tyrannosaurus / Glossoptera] were found in India, Africa, and Antartica.
In trying to prove continental drift, Alfred Wegener used evidence from long ago to show that in the distant past, similar animal species lived in places that are separated by great distances today. For example, fossils of the Mesosaurus were found in India, Africa, and Antarctica.
Which features do most stratovolcanoes and cinder cone volcanoes have in common?(1 point)
Responses
steep sides and violent eruptions
steep sides and violent eruptions
broad base with quiet eruptions
broad base with quiet eruptions
wide dome shape and thick lava
wide dome shape and thick lava
violent eruptions and thin, flowing lava
Responses
steep sides and violent eruptions
steep sides and violent eruptions
broad base with quiet eruptions
broad base with quiet eruptions
wide dome shape and thick lava
wide dome shape and thick lava
violent eruptions and thin, flowing lava
steep sides and violent eruptions
Ocean trenches form over millions or billions of years. Which statement accurately describes how ocean trenches form?(1 point)
Responses
a plate of continental crust collides with another plate of continental crust
a plate of continental crust collides with another plate of continental crust
two plates of oceanic crust pull away from each other
two plates of oceanic crust pull away from each other
two plates of continental crust slide past each other
two plates of continental crust slide past each other
a plate of oceanic crust is subducted under a plate of continental crust
Responses
a plate of continental crust collides with another plate of continental crust
a plate of continental crust collides with another plate of continental crust
two plates of oceanic crust pull away from each other
two plates of oceanic crust pull away from each other
two plates of continental crust slide past each other
two plates of continental crust slide past each other
a plate of oceanic crust is subducted under a plate of continental crust
a plate of oceanic crust is subducted under a plate of continental crust
Geologists observed signs of widespread ancient glaciers from the same time period in areas across South America, Africa, Antarctica, India, and Australia. What theory did this observation support?(1 point)
Responses
Earth was much farther than the sun than it is today.
Earth was much farther than the sun than it is today.
Glaciers were once more common than they are today.
Glaciers were once more common than they are today.
Those continents were once together as one supercontinent.
Those continents were once together as one supercontinent.
Most of Earth was once covered in a vast ice sheet.
Responses
Earth was much farther than the sun than it is today.
Earth was much farther than the sun than it is today.
Glaciers were once more common than they are today.
Glaciers were once more common than they are today.
Those continents were once together as one supercontinent.
Those continents were once together as one supercontinent.
Most of Earth was once covered in a vast ice sheet.
Those continents were once together as one supercontinent.