Which best supports the evidence that an asteroid collision may have caused the extinction of dinosaurs?(1 point)

Question

Responses

Dinosaur fossil remains are found at the bottom of a body of water.
Dinosaur fossil remains are found at the bottom of a body of water.

Rare metal on Earth called Iridium is found in layers where dinosaurs disappeared.
Rare metal on Earth called Iridium is found in layers where dinosaurs disappeared.

Many dinosaur skeletons are found in one particular rock layer.
Many dinosaur skeletons are found in one particular rock layer.

Bodies of dinosaurs are only found in craters where asteroid collided.
Bodies of dinosaurs are only found in craters where asteroid collided.

Answer 1

The response that best supports the evidence that an asteroid collision may have caused the extinction of dinosaurs is:

Rare metal on Earth called Iridium is found in layers where dinosaurs disappeared.

The presence of iridium, which is more commonly found in asteroids, in these layers provides strong evidence for the hypothesis that an asteroid impact contributed to the mass extinction event that led to the demise of the dinosaurs.

Answer 2

Which is correct about fossils location and age?(1 point)
Responses

Fossils found in rock layers that have been disturbed are the oldest.
Fossils found in rock layers that have been disturbed are the oldest.

Fossils found in among numerous other fossils are most recent in age.
Fossils found in among numerous other fossils are most recent in age.

Fossils found in lower rock layers are older than fossils found in upper layers.
Fossils found in lower rock layers are older than fossils found in upper layers.

Fossils found in rock layers closest to Earth’s surface are the oldest.
Fossils found in rock layers closest to Earth’s surface are the oldest.

Answer 3

The correct statement about fossils, location, and age is:

Fossils found in lower rock layers are older than fossils found in upper layers.

This principle is based on the law of superposition, which states that in undisturbed rock layers, the oldest layers are at the bottom and the youngest layers are at the top.

Answer 4

Why are time periods on the geologic time scale not even in length?(1 point)
Responses

They are based on the type of fossils found in rock layers of the Earth.
They are based on the type of fossils found in rock layers of the Earth.

They are based on important events that happened in Earth’s history.
They are based on important events that happened in Earth’s history.

They are based on the thickness of the Earth's rock layers.
They are based on the thickness of the Earth's rock layers.

They are based on a different type of calendar used to track Earth’s history.
They are based on a different type of calendar used to track Earth’s history.

Answer 5

The correct response is:

They are based on important events that happened in Earth’s history.

The divisions in the geologic time scale are not uniform in length because they are based on significant events such as mass extinctions, major climate changes, and other geological and biological milestones that mark significant changes in the Earth’s history.