Niagara Falls were formed _______.
a - during Precambrian time approximately a billion years ago
b - so long ago that the river's knickpoint is now gone
c - after a series of spectacular earthquakes which are still helping the falls evolve
d - by humans as a result of the damming of the St. Lawrence river
e - after the retreat of the Pleistocene ice sheets a few thousand years ago
e - after the retreat of the Pleistocene ice sheets a few thousand years ago
You might also like to view...
The uneven, potholed surface of karst is caused by ____
a. ?erosion from ancient streambeds b. ?the pattern of deposited material from glaciers c. ?hardening of volcanic ash into tuff d. ?swelling due to the absorption of water e. ?the dissolution of the surface in the presence of acids
During elongation how many of the general transcription factors remain with the RNA polymerase?
A) 0 B) 1 C) 2 D) 3
Of the autonomies, the oblast have the greatest authority to self-rule
a. True b. False Indicate whether the statement is true or false
Because Alaska is so cold, the Trans-Alaska Pipeline had to be heated along much of its length to keep the oil flowing and to avoid damage from freezing soil.
Answer the following statement true (T) or false (F)