Unit 9 Geologic Time

Which era on the Geological Time Scale is when Dinosaurs appear on Earth.

• Pre-Cambrian

• Paleozoic

• Mesozoic

• Cenozoic

Which era on the Geological Time Scale did Human's appear on Earth.

• Pre-Cambrian

• Paleozoic

• Mesozoic

• Cenozoic

The era of the Geological Time Scale where many organisms appear in a short period of time.

• Pre-Cambrian

• Paleozoic

• Jurassic

• Cenozoic

This era in the Geological Time Scale lasted over 4000 years and only single-celled organisms appear.

• Pre-Cambrian

• Mesozoic

• Cenozoic

• Paleozoic

How old is planet Earth?

• 4.6 billion years old

• 4.6 million years old

• 2022 years old

• 6.4 billion years old

In years, how long is 1 half-life?

• 3 Billion Years

• 3.7 million years

• 4.5 Billion Years

• 0.5

Parent Atom + Daughter Atom = _____%

• 50%

• 100%

• 1/3 %

• 60%

Why are isotopes of radioactive elements unstable?

• They have different numbers of neutrons

• they have too many electrons

• Too many horcruxes

• They have too many half-lifes

The steps and process that dates events in a sequence making it easier to compare is called

• Absolute Dating

• Double Dating

• Relative Dating

• Radioactive Dating

_______ are the remains or traces of once living things

• Geology

• Time Capsule

• Memories

• Fossils