Unit 10 Review History of the Earth

Which of these choices is the best definition of absolute dating?

• determining the age of a rock layer by studying the fossils present

• finding the age of an object compared to other objects

• measuring the age of an object in years using any method

• determining the amount of a radioactive isotope in an object

What is the method of measuring age that gives the most precise results?

• radioactive dating, when scientists measure the levels of an isotopic element inside of an object

• rate of sedimentation, which dates layers of Earth based on their thickness

• law of superposition, which dates layers of Earth based on their order

• relative dating, when scientists fill an object with carbon and measure how much will fit

Which method determines the relative age of Earth's sedimentary layers based on their organization?

• rate of sedimentation

• law of superposition

• radioactive dating

• Fossil Comparison

Tags

NGSS.MS-ESS1-4

Which of these choices is an example of the way a geologist would use

relative dating (The Law of Superposition)?

• determining the minerals that make

  up rocks

• determining the ages of rock by comparing the order of the layers

• classifying rocks as igneous,

  sedimentary, or metamorphic

• using radioactive isotopes to

  determine the exact age of rock samples

Tags

NGSS.MS-ESS1-4

Which of these statements describes what happens during radioactive decay?

• A Stable isotope interacts with an unstable isotope

• A stable isotope breaks down and becomes unstable

• An unstable isotope breaks down into a more stable isotope.

• An unstable isotope interacts with another unstable isotope.

Tags

NGSS.HS-PS1-8

_______ is the amount of time it takes for 50% of the remaining radioactive material to decay into a stable material.

• Half-life
• Radioactive decay

• relative dating

• law of superposition

What type of rock contains clues to the earth's past history?

• Metamorphic Rock

• Sedimentary Rock

• Igneous Rock

• Limestone Rock

Why is the Law of Superposition a law not a theory?

• It says that rock layers are in order from oldest to youngest but does not explain why.

• It is proven and not just a hypothesis

• It explains why rock layers are in chronological order.

• It is just a hypothesis but has not been proven.

What are Intrusions and Extrusions layers made from?

• Igneous rock

• Metamorphic rock

• Sedimentary rock

• Uranium

What law states that in undisturbed layers of sedimentary rocks, the lowest layers contain the oldest rocks (examples of relative dating)

• Law of Cross-cutting

• Law of horizontality

• Law of Superposition

• Law of Lateral continuity