Exam 23: Geologic Timereading the Rock Record

If the half-life of some radioactive element is 1 billion years, and a mass of rock originally contained 100 g of that element, how many grams of the radioactive element would be left after three billion years had passed?

In general, when we refer to the time of the "Ice Age" we are referring to the

The geologic time scale is broken up into time units of different sizes based on

Which of the following is not a presumed cause of ice ages?

Radiometric dating is based on

The Andes and the Sierra Nevada Mountains began to form during the Mesozoic due to

The laws of physics, chemistry, and geology have operated unchanged through time to shape Earth as we know it today can be summed up by the idea of

Sediments deposited in an even, horizontal manner illustrate the principle of

The Permian extinction predominantly affected

The Paleozoic era begins with the Cambrian and concludes with the

What spectacular development in organisms marks the beginning of the Paleozoic era?

What is the most widely accepted hypothesis for the dinosaur extinction at the end of the Cretaceous period?

The supercontinent of Pangaea formed during the

During the Cretaceous period, Earth experienced a worldwide rise in sea level caused by

An unconformity is

Organisms with the ability to be easily preserved as fossils began to flourish about

Iridium is an element that is relatively

During the Pleistocene ice age

Rocks from the Carboniferous period are significant because they

To date a rock thought to be many millions of years old, you should NOT use the decay of