Geologic Time Review

About how old do scientists believe Earth to be?

• 4.5 Billion Years Old

• 4.5 Trillion Years Old

• 4.5 Million Years Old

• 4.5 Thousand Years Old

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When you look at Earth's entire history, how long have humans been around?

• We've been here the whole time, 4.5 billion years

• We've been here for most of the time, about 2 billion years

• We're pretty new, humans have only been around for about 200,000 years

What gas did cyanobacteria release into the atmosphere that helped life form?

• Oxygen

• Helium

• Carbon Dioxide

• Sulfur

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What era are we currently living in?

• Cenozoic Era

• Paleozoic Era

• Mesozoic Era

Which era was the "age of reptiles"?

• Cenozoic Era

• Mesozoic Era

• Paleozoic Era

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What law tells us the relative age of rock layers?

• The Law of Superposition

• The Law of Radiometric Dating

• The Law of Rock Layers

• The Law of Fossils

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True or False: A fossil found towards the surface of Earth is older than a fossil found deep underground?

• True

• False

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NGSS.MS-ESS1-4

NGSS.MS-LS4-1

Where are the youngest rock layers found?

• At the top of the strata, close to the surface of the Earth

• Deep underground, at the bottom of the rock strata

• In the middle of the rock strata

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NGSS.MS-ESS1-4

What is the name of the process scientists use to find the EXACT age of rock layers?

• Radiometric Dating

• Rock Science

• Relative Dating

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NGSS.MS-ESS1-4

True or False: All of Earth's water came from tiny crystals carried inside of meteors that collided with Earth.

• True: It took years and years for enough meteors to hit Earth to give us all of the water we have today.

• False: That's just crazy, there's no way that could've happened!

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NGSS.HS-ESS1-6