Earth's Geologic History

_______________ is the process by which unstable atoms emit radiation until they become stable.

• Radiation

• Radioactive Decay

• Chemical Reaction

• Isotopes

Tags

NGSS.HS-PS1-8

A certain radioactive sample has a half life of 2 years. After 6 years, how much of the original sample is left?

• 1/2

• 1/16

• 1/3

• 1/8

Tags

NGSS.HS-PS1-8

What is Half-life?

• The amount of time it takes for some of the nuclei in a sample of the isotope to decay

• The amount of time it takes for half the nuclei in a sample of the isotope to decay

• The amount of time it takes for half the electrons in a sample of the isotope to decay

• the amount of time it takes to double the nuclei in a sample of the isotope to decay

Tags

NGSS.HS-PS1-8

How much of the parent isotope remains after three half lives?

• 12.5%

• 25%

• 50%

• 75%

Tags

NGSS.HS-PS1-8

Which of the following can be learned by using the fossil record?

• When organisms changed or evolved

• when organisms became extinct

• when organisms appeared on Earth

• All the above

Tags

NGSS.MS-LS4-1

Which are considered as oldest fossils? Why?

• B and C. They are closest to the top

• They are all the same age. They are all found on Layer 2.

• A and B. They are closest to the bottom

• A, and B. They are found closest to the top

Tags

NGSS.MS-ESS1-4

NGSS.MS-LS4-1

In which kind of rock do we usually find a fossil?

• sedimentary rock

• igneous rock

• metamorphic rock

• all types of rocks

Tags

NGSS.MS-LS4-1

What could scientists infer when they find this fossil?

• Scientists can infer what fish are like today.

• Scientists can infer that water once covered the area where this fossil was found.

• Scientists can infer that this fish lacked oxygen.

• Scientists can infer that this fish is common.

Tags

NGSS.MS-LS4-1

Which of the following could lead to the gradual extinction of a species?

Choose 2 answers.

• Meteor Strike

• Massive Volcanic Eruption

• Rising Sea Levels

• Glaciation

Tags

NGSS.MS-LS2-4

NGSS.MS-LS4-1

NGSS.MS-LS4-4

Why are similar fossils found all over the world?

• The animals swam to new parts of the world before going extinct.

• The land masses were once connected.

• The organisms were transported to different areas of the world

• They are not similar fossils.

Tags

NGSS.MS-ESS2-3