Exam 12: Impact of Extraterrestrial Objects

How big was the meteorite that apparently caused the Cretaceous-Tertiary mass extinction?

A meteorite impact crater can be distinguished from a volcanic crater through the presence of

One option for preventing a major meteorite impact would be to nudge the object into a different orbit using ________.

The Cretaceous-Tertiary impact event was first discovered through the chemistry of sediments.

The Chicxulub impact crater was the first evidence to suggest that a meteorite impact caused the Cretaceous-Tertiary mass extinction.

The Tunguska event would likely have killed millions of people if it had happened over a heavily populated area.

A meteor is

Why is the probability of dying from a meteorite impact greater than that of dying in an automobile accident?

What would be the principal option for preventing a catastrophic meteorite impact, once a threatening object was identified?

The meteorite that struck the Yucatan Peninsula was about ________ kilometers in diameter.

A(n) ________ is a bowl-shaped depression caused by a meteorite striking the Earth's surface.

The extinction of large mammals at the end of the ________ Epoch may have been caused by a meteorite.

Because of a thinner ________, there are more impact craters on the Moon than on Earth.

The impact crater resulting from the Cretaceous-Tertiary meteorite impact was found in the country of ________.

A meteoroid is

Two government projects are tracking ________ that might become threats to Earth.

There is very little chance that we will know of a likely catastrophic meteorite impact ahead of time.

Most asteroids are found between Mars and Jupiter.

An anomaly of the element ________ marks the Cretaceous-Tertiary boundary in several locations around the world.

An aerial burst occurred in the Tunguska River valley of ________ in 1908.