1. Geologic Time

2. Smashing something with a hammer is an example of ___________ weathering.
Acid rain breaks down rocks like limestone easily. What kind of weathering is this?
Wind and water are great agents of _________ weathering.
A stream that carries sediment to the ocean is an example of ___________.
The Grand Canyon has been ____________ by water over millions of years.

3. Order them from longest to shortest
The time between…
The formation of the Himalayan mountains and today.
Dino extinction and today.
Origin of the earth and the development of multi-celled organisms.

4. "Nescire autem quid ante quam natus sis acciderit, id est semper esse puerum.“ "To be ignorant of what occurred before you were born is to remain always a child."

6. Geologic Time Table
Summary of the major events of the Earth’s history.
Eras
Precambrian or Proterozoic
4, million years ago.
Largest era (87%)
Lack of fossil evidence
Early single celled organisms

8. Paleozoic 570 million years old
Abundant fossils of both plants and animals from the ocean and land.
Known as the “Age of Invertebrates”

10. Mesozoic 230 million years old Known as the “Age of Reptiles”
Dinosaurs thrived.

12. Cenozoic 65 million years old to present Known as the “Age of Mammals”
Humans – last

15. Era’s are subdivided into periods.
Periods are subdivided into epochs.