Exam 4: The Habitability of Earth

Which terrestrial planet(s) have magnetic fields?

The Earth's geological time scale is divided into four main

Planetary scientists use crater counts to estimate the

A radioactive isotope with an atomic number of 92 undergoes alpha decay. What is the atomic number of the daughter nucleus?

At the beginning of which eon of Earth's history do we find the earliest evidence of life?

Rocks are found on the surface of another planet which appear to have once been transformed at high temperatures deep within the planet. Given this, they are most likely to be classified as

Seafloor spreading on the Earth is the process by which

If originally there were X atoms of radioactive isotope present and now there are only X/16 atoms, how many half-lives have elapsed?

The strongest of evidence that supports the giant impact model for the formation of the Moon is that the

If originally there were X atoms of radioactive isotope present and now there are only X/4 atoms, how many half-lives have elapsed?

During snowball Earth phases, glaciers

Evidence from the analysis of zircon crystals suggests that the Earth

In which eon of Earth's history did the early bombardment occur?

Which type or types of rock cannot be dated radiometrically?

During the past few million years, ice ages were MOST LIKELY caused by

The sweeping of atmospheric gas particles into space by the Sun is referred to as

The radioactive isotope ⁷Be (atomic number 4) decays to the isotope ⁷Li (atomic number 3). What type of radioactive decay is this?

The Earth's crust appears to have already differentiated from the interior approximately

What is the most important role that the carbon dioxide cycle plays in the regulation of the Earth's climate?

Fossils typically contain little or no organic matter because