The dust bowl was caused by a
a. windstorm.
b. drought.
c. tornado.
d. famine.

How did the lab activities you answer the lesson question: what effect does plate movement have on geologic events and structures at earth’s surface? what did you learn from conducting this lab?

Some fossils provide evidence to suggest that earth's climate has changed over time. which information can scientists obtain from these fossils? check all that apply

These factors threaten north americas ecosystems