The earth through time

Who studies the rocks?

• garbologists

• geologists

• paleontologists

How can the radioactivity of the rocks be measured?

• using a metal detector

• using a special detector

• using an iron

You can find the age of the rocks by...

• their weight

• their smell

• their radioactivity

What rocks are less radioactive?

• new rocks

• older rocks

• shiny rocks

The time periods in which changes happened are called...

• months

• eons

• ions

How old is the earth approximately?

• about 4500 years old

• about 6000 years old

• about 4600 years old

Eons are divided in smaller units.

• True

• False

Select which one was an eon:

• Maiden

• Protezoic

• Archer

An eon is divided into years.

• True

• False

The Phanerozoic eon is divided in Paleozoic, Mesozoic and _____ eras.

• Cenozoic

• Eonzoic

• Kwashiorkor