Earth's History and Continental Drift/Plate Tectonics Review

There have been how many major extinction events on planet Earth?

• 5

• 3

• 2

• 4

The worst mass extinction event in the history of the Earth wiping out 96% of all life was the 

• Permian-Triassic

• Holocene

• Triassic-Jurassic

• Ordovician-Silurian

The period of time where conditions were harsh and no life forms existed was the ______________.

• Pleistocene

• Cambrian

• Hadean

• Holocene

The moon was formed according to the Giant Impact Hypothesis which states: Earth-Moon system formed as a result of a giant impact with a body known as Theia. 

• True

• False

What is a mass extinction?

• When all the species in a particular area on Earth suddenly go extinct

• When one species goes extinct due to habitat changes

• When multiple species from all over the Earth suddenly go extinct

• When all life on Earth is wiped out

According to most scientists, what is the ultimate cause of most mass extinctions?

• overhunting

• evolution of new species to replace old ones

• major change in environment or climate

• asteroid impact

____________________ is the age of a geologic event based on the absolute number of years ago it occurred.

• Absolute age

• Half-Life

• Radiometric Dating

• Isotope

__________________ the time it takes for half of the atoms of a radioactive isotope in a sample to decay

• Isotope

• Radiometric Dating

• Absolute Age

• Half-Life

_______________ measures the concentrations of radioactive isotopes and their decay products.

• Radiometric Dating

• Isotope

• Absolute Age

• Half-Life

_______________ Atoms of the same element that have different numbers of neutrons.

• Radiometric Dating

• Half-Life

• Isotope

• Absolute Age