Concept check

Which geologic event occurred during the Mesozoic era?

• Pangaea formed

• Asteroids killed the dinosaurs

• The Rocky Mountains formed

• The Pleistocene Ice Age began

The geologic time scale is subdivided into 4 groups. List them

from the largest to the smallest.

• Eons, periods, epochs, eras

• Eras, eons, periods, epochs

• Epochs, periods, eras, eons

• Eons, eras, periods, epochs

The end of this era was believed to be caused by a comet or

asteroid colliding with Earth, causing a huge cloud of dust and

smoke to rise into the atmosphere, blocking out the sun.

• Paleozoic

• Holozoic

• Mesozoic

• Cenozoic

The Mesozoic Era was the Age of Reptiles while the current

Cenozoic Era is the Age of

• Mammals

• Birds

• Humans

• Technology

Who formulated the idea of evolution by natural selection?

• Lamarck

• De Vries

• Darwin

• Linnaeus