To put it shortly, the answers are C, D, E, and F.
With C. being "Increased Immigration",
D. being "The desire for adventure/land/riches",
E. being "The Discovery of gold", and
F. being "The Homestead Act".
Hope this helps :)
Answer:
The correct answer is - D. temperature.
When a meteorologist says that it is hot or cold, then they are describing the temperature.
<em>i hope this helps</em>
The correct answer is C. It is used to determine the absolute dates in years for different periods.
Explanation
The geological timescale is a tool that has been developed over the years by geologists to establish a frame of reference in which important events in the history of the Earth and life are represented in chronological order. This scale is organized from divisions and subdivisions, from the relative age of the rocks according to their relative age and the absolute time elapsed since the formation of the Earth to the present. Through this scale it has been possible to establish historical periods such as when dinosaurs lived. So the correct answer is C.