Which statement explains why ammonites are a good example of an index fossil?(1 point)

Question

Responses

Ammonites existed in a small geographic area.
Ammonites existed in a small geographic area.

Ammonites existed only in the oceans.
Ammonites existed only in the oceans.

Ammonites existed long before the dinosaurs.
Ammonites existed long before the dinosaurs.

Ammonites existed for a relatively limited period of time.
Ammonites existed for a relatively limited period of time.

Answer 1

The correct statement that explains why ammonites are a good example of an index fossil is:

Ammonites existed for a relatively limited period of time.

Index fossils are used to identify and date the age of rock layers because they were widespread but only existed for a short, specific period in geological time.

Answer 2

What is the theory that describes the movement of landmasses on Earth’s surface?(1 point)
Responses

continental drift
continental drift

plate tectonics
plate tectonics

divergence
divergence

subduction

Answer 3

The theory that describes the movement of landmasses on Earth’s surface is plate tectonics.

While "continental drift" refers specifically to the gradual movement of continents, plate tectonics encompasses the broader concept that includes the movement of all tectonic plates, which comprise the Earth’s lithosphere.

Answer 4

How does the fern Glossopteris provide evidence for the movement of the continents?(1 point)
Responses

It existed in the Permian period.
It existed in the Permian period.

It is the oldest plant on Earth.
It is the oldest plant on Earth.

It lived at the same time as Lystrosaurus.
It lived at the same time as Lystrosaurus .

It was found on many continents.
It was found on many continents.
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Answer 5

The correct response is:

It was found on many continents.

Glossopteris is an extinct genus of ferns that has been discovered on multiple continents, including South America, Africa, Antarctica, Australia, and India. This widespread distribution supports the theory of continental drift, indicating that these landmasses were once connected, allowing the plant to inhabit a larger area.

Answer 6

Which is a result of Earth’s magnetic poles reversing over time?(1 point)
Responses

volcanoes occurring at tectonic plate boundaries
volcanoes occurring at tectonic plate boundaries

high amounts of iron found in ocean rocks
high amounts of iron found in ocean rocks

distinct bands in rocks that contain magnetic particles
distinct bands in rocks that contain magnetic particles

magma rising to the ocean floor at mid-ocean ridges

Answer 7

The correct response is:

distinct bands in rocks that contain magnetic particles.

As Earth's magnetic poles reverse over time, the magnetic minerals in rocks align with the current magnetic field when they cool. This results in distinct bands of magnetic orientation in the oceanic crust, providing evidence of the history of geomagnetic reversals.

Answer 8

How are earthquakes at continental plate boundaries different from earthquakes at mid-ocean ridges?(1 point)
Responses

They are longer in duration.
They are longer in duration.

They begin closer to Earth’s surface.
They begin closer to Earth’s surface.

They begin deeper in Earth’s crust.
They begin deeper in Earth’s crust.

They are shorter in duration

Answer 9

The correct response is:

They begin deeper in Earth’s crust.

Earthquakes at continental plate boundaries often originate deeper in the crust compared to those at mid-ocean ridges, where earthquakes generally occur at shallower depths due to the tectonic activity related to seafloor spreading.

Answer 10

Which describes ocean rocks that are found near mid-ocean ridges?(1 point)
Responses

They are older and form through the cementation of sediments.
They are older and form through the cementation of sediments.

They are older and form through the cooling of magma.
They are older and form through the cooling of magma.

They are younger and form through the cooling of magma.
They are younger and form through the cooling of magma.

They are younger and form through the cementation of sediments.

Answer 11

The correct response is:

They are younger and form through the cooling of magma.

Ocean rocks found near mid-ocean ridges are younger because they are formed from the cooling of magma that rises to the surface as tectonic plates diverge, creating new oceanic crust.