The earliest of civilizations were based around river valleys. This allowed them to irrigate fresh water to their crops allowing for better farming and therefore, bigger and better civilizations.
Answer:
a. They must be present in a large geographic area.
Explanation:
Index fossils can be used to determine the age of a rock strata with great precision, but they must be scattered over a large geographic area to be able to be used reliable for this type of measurement. Index fossils typically indicate a certain type of paleoenvironment belonging to a very specific prehistoric period and their formation coincides with the age of the rock layer.
Geography is land based areas and regions that were constructed by nature, (dirt,iron,ore) it relates to the construction industry because they used the materials nature has used to create the land.
Answer : The epicenter, epicentre or epicentrum in seismology is the point on the Earth's surface directly above a hypocenter or focus, <u>the point where an earthquake or an underground explosion originates</u>.
Explanation : There are two ways you can spell it : epicenter or <em>epicentre</em>. I hope I helped you out!
