Answer:
A. True
Explanation:
It is true that a V-shaped valley and no floodplain indicate a youthful, downcutting stream.
A giant asteroid slamming into the earth
Answer:
Alfred Wegener
Explanation:
The drifting of tectonic plates is an on-going process that has changed the configuration of the continents since their formation in Archean time. This hypothesis first proposed in 1912 by Alfred Wegener, a German Meteorologist, was not widely accepted until after 1960.
This is correct. Even the basic scientific theories get tested and checked time after time after time. The most basic example would be that people once thought the Earth was flat and now it changed and they believe it is round.
Many maps have a grid system, scale and a
compass
