Exam 8: The Terrestrial Planets and Earths Moon

If you obtained a sample of Martian rock, determined the abundances of ²³⁰U and ²⁰⁷Pb in it, and found that for every one uranium atom there were seven lead atoms, what would be the age of this rock? Note that ²³⁰U decays to ²⁰⁷Pb with a half-life of 700 million years.Assume that there was no ²⁰⁷Pb in the rock when it originally formed.

We have direct evidence for the recent existence of water on the surface of which terrestrial object?

The small peak found in some meteor craters is

Which of the following is a reason that we suspect that the extinction of the dinosaurs was caused by an explosive impact by a large object?

Which of the following is a reason for the large size of volcanoes on Mars as compared to Earth's smaller volcanoes?

Of the terrestrial planets, which have active plate tectonics?

If a radioactive element has a half-life of 10,000 years, what fraction of it is left in a rock after 40,000 years?

According to studies of impact cratering, which of these terrestrial objects has, on average, the oldest surface?

Give a specific example of a historical impact of an asteroid or comet that hit Earth.Why are impact craters rare on the surface of Earth but plentiful on the Moon?

Which of these three lunar surfaces shown in the figure below is the oldest?

What is the age of our Solar System?

What is the main reason that part of Earth's interior is liquid today?

Plate tectonics is NOT responsible for

Which of the following processes can reduce the temperature of a planet?

The Moon has a diameter that is approximately one-fourth that of Earth.If these objects' interiors are heated by radioactive decays and the total amount of energy in decays is proportional to the object's volume, how does the amount of internal heat the Moon has compare to that of Earth?

Which of the following will remove ("smooth out") features on a planet's surface?

How do astronomers determine the average density of a planet using an orbiting object? How do they estimate the material composition of the planet without surface measurements?

Which of the follow is evidence for Mars once having had liquid water on its surface?

A wave whose amplitude is perpendicular to its direction of motion is

The fact that Earth's interior is differentiated suggests that