History of Earth

What is a Half-life?

• The breakdown of unstable elements into stable elements

• The time it takes for half of the given amount of an isotope to decay

• Same thing as a Horcrux

• How long an Alpha element lives

Tags

NGSS.HS-PS1-8

What is Radioactive Decay?

• The breakdown of unstable elements into stable elements

• The time it takes for half of the given amount of an isotope to decay

• Bioluminescent algae

• When a Beta element decays

Tags

NGSS.HS-PS1-8

If you start out with 100 grams of Carbon-13 (and Carbon-13's half life is 6,200 yrs), how many grams of Carbon-13 will you have after 12,400 yrs?

• 100

• 50

• 25

• 15

Tags

NGSS.HS-PS1-8

What is the most correct definition of a Satellite, in terms of space?

• They're metal, sit in space, and rotate around the earth

• What we use to communicate with alients

• Something that sits on top of your roof

• An object that moves around a larger object

What type of rocks is Radiometric Dating not useful for?

• Igneous

• Metamorphic

• Sandstone

• Sedimentary

Radioactive decay takes place because all elements want to be stable.

• True

• False

Tags

NGSS.HS-PS1-8

When an organism dies, it stops taking in what?

• Carbon

• Water

• Hydrogen

• Salt

What are meteorites made up of? (click all correct answers)

• Oxygen

• Silicon

• Iron

• Nickel

Tags

NGSS.HS-ESS1-6

Earth is considered a Satellite.

• True

• False

All elements are stable.

• True

• False