Earth History Flashcard 1

Front

What is the significance of the lettered dots on a geologic timeline?

Back

The lettered dots represent significant events in Earth's history, helping to visualize the timeline of geological events.

Tags

NGSS.MS-ESS1-4

Front

When did humans first appear on Earth according to geologic time?

Back

Humans first appeared on Earth at the end of the Cenozoic Era, indicated by the letter D on the timeline.

Tags

NGSS.HS-LS4-2

Front

What geological period is associated with the position of New York State on the continent?

Back

The Devonian Period is associated with the inferred position of New York State on the continent.

Tags

NGSS.MS-ESS2-3

Front

Why does the Moon have more visible impact craters than Earth?

Back

The Moon has more visible impact craters because Earth's atmosphere prevents many impacts and geological activity erases craters.

Front

What is the role of Carbon-14 in dating fossils?

Back

Carbon-14 is used to date organic materials, such as fossils, because it is a radioactive isotope that decays over time.

Front

What percentage of a radioactive isotope remains after 3 half-lives?

Back

12.5% of the original amount of a radioactive isotope remains after 3 half-lives.

Tags

NGSS.HS-PS1-8

Front

Define 'geologic time scale'.

Back

The geologic time scale is a system of chronological dating that relates geological strata to time, used to describe the timing and relationships of events in Earth's history.

Front

What are the main factors that contribute to the preservation of impact craters on celestial bodies?

Back

The preservation of impact craters is influenced by factors such as atmosphere, geological activity, and erosion.

Front

Explain the concept of half-life in radioactive decay.

Back

Half-life is the time required for half of the radioactive atoms in a sample to decay into a different element or isotope.

Tags

NGSS.HS-PS1-8

Front

What is the difference between a parent isotope and a daughter isotope?

Back

A parent isotope is the original radioactive isotope that undergoes decay, while a daughter isotope is the product of that decay.

Tags

NGSS.HS-PS1-8