Answer:
d.
Explanation:
they help out the people with questions and who are in need
The Principle of Cross-Cutting tells us that a fault must be older than the rock it cuts. Cross-cutting in geology was formulated by Nicolas Steno, a Danish geologist in the mid-1600's. It is usually used in combination with radiometric age dating, which can tell the geologist how old the rock is.
Fertile soil, favorable climate, extremely cheap labor, and rivers used for transportation