The Bering Strait
a. is between Alaska and Russia.
b. is between Europe and North America.
C. is between South America and the Antarctic.
d. is in the St. Lawrence Seaway.
a. is between Alaska and Russia.
Kennewick Man
a. was decided to be 9.400 years old.
b. was found with artifacts similar to Clovis artifacts.
C. was found with a broken spear tip in his hip showing someone took care of him.
d. was all of the above according to current research.
d. was all of the above according to current research.
When did people begin living in the land we know today as North America?
a. People arrived about 2,000 years ago.
b. People have lived on American soil for over half a million years.
C. The first people came with Christopher Columbus in 1492.
d. Scientists and historians do not have enough evidence to know for sure.
d. Scientists and historians do not have enough evidence to know for sure.
During the past 100,000 years, there were at least glacial periods.
A. 4
b. 12
C. 20
d. 60
What happens when glaciers melt?
a. land bridges are covered with water
b. climate changes result in animal extinctions
c. glaciers melt and cause massive floods
d. all of the above
d. all of the above
Which statements about geologic time are true? Check all that apply.
Scientists developed the geologic time scale as they studied rock layers and index fossils.
The fossil record helps scientists describe life only in the seas and other bodies of water.
Precambrian time is the most recent time in Earth's history.
Precambrian time makes up 88 percent of Earth's history.
The first birds appeared during the Jurassic period.
The basic units of the geologic time scale are periods, eras, and centuries.
Humans appeared during the Cenozoic era.
- Scientists developed the geologic time scale as they studied rock layers and index fossils.
- Precambrian time makes up 88 percent of Earth's history.
- Humans appeared during the Cenozoic era.