9 geological time scale

1.Which of the following scientists study the Earth's organisms?111

• Geologists

• Paleontologists

• Neither A or B

• Both A and B

2) Why do geologists use radioactivity?

• To determine the age of the Earth

• To determine the age of substance found on Earth

• To determine the length of time a living thing has lived

• To determine how long each time-period lasted on Earth

3) Which of the following Geologic Time eras is found in the seas only?

• 
  Cenozoic

• Mesozoic

• Precambrian

• Paleozoic

4) Which of the following Geologic Time eras is called the 'age of Reptiles'?

• Mesozoic

• Precambrian

• Paleozoic

• Cenozoic

5) Which of the following Geologic Time eras is Earth currently in during the 2000s?

• Mesozoic

• Precambrian

• Paleozoic

• Cenozoic

6) The Geologic Time System (GTS) uses all the following to identify time EXCEPT:

• Seconds and minutes

• Eons and eras

• Epochs

• Events