A(n) _____________ is a substance that cannot be broken down into a simpler substance.

Atoms of the same element that have a different number of neutrons are called _______________.

_____________ is all of space and everything in it including space, stars, and planets.

______________ is that theory that states the universe began about 13.7 billion years ago in one giant explosion.

How old is Earth? ____ billion years old.

__________________ is an object launched into space by NASA around the earth in 1990 to provide information about the universe.

________________ is an educated guess.

________________ is the numeric age of an object or event, often stated in years before the present, an example is radiometric dating.

________________ is a method of determining the absolute age of an object by comparing the relative percentages of a radioactive (parent) isotope and a stable (daughter) isotope.

_______________ is a spontaneous process by which an unstable nucleus loses energy.

Why is radioactive decay used to determine the absolute age of rocks?

_____________ is the time required for half of a sample of a radioactive isotope to break down by radioactive decay to form a daughter isotope.

An approximate age of something compared to some other event in history is called____________

A process in which the materials of Earth’s surface are loosened, dissolved, or worn away and transported from one place to another is called _________________.

What do scientists count in order to learn the age of a planetary surface? __________________

Which of these is NOT a reason why does Earth has less craters than Mars?

Surfaces that have more craters are

If you began with 300g of a parent isotope, you would have 75g of that isotope after two half–life of that isotope. How many grams are left after 3 half–lives?

Carbon–14 half–life is 5720 years. If a fossil containing Carbon–14 went through 4 half–lives, how old is the fossil?

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