ESS Unit 6 - Geologic Time

The half-life of an isotope is an amount of...?

What is the relative percentage of the daughter isotope compared to its parent after 3 half-lives?

A key bed could result from a major volcanic eruption.

Any interruption to the deposition of a sedimentary layer of rock is called a(n)...?

Which length of geologic time is the shortest?

Which of these is a natural process that occurs at a predictable rate and keeps a record of its own progress?

A key bed could result from a large meteorite impact.

Which principle states that geologic layers always start flat?

It would be appropriate to use C-14 decay to measure the age of rocks formed toward the beginning of our solar system.

Which of these is the process geologists use to match up rocks of similar age in different locations?

When Carbon-14 radioactively decays into Nitrogen-14, the N-14 isotope is the _______ while the C-14 is the _______.

Which type of unconformity do we see when we look at the Grand Canyon?

Which type of unconformity is a layer of sedimentary rock on top of older metamorphic and igneous rock?

Which type of unconformity happens from a combination of plate tectonics and erosion?

Which length of geologic time is the longest?

Which concept is based only on the order in which events take place?

Which of the following characteristics do we NOT want in an index fossil?

The process of using half-lives to determine the ages of rocks is called ________ dating.

Which of the following periods is NOT part of the Mesozoic Era?

Evreything that has happened since around 541 million years ago is considered Precambrian.

Which principle states that the oldest layers will be on the bottom?

The Principle of Faunal Succession is based on the idea that species lived in a recognizable order through time.

Which of the following Eras is NOT part of the current Phanerozoic Eon?

Isotopes are different versions of the same element because they have different numbers of...?

Which concept is based on the exact number of years ago an event occurred?