I believe it’s 4 opportunity cost
Answer: c. internal summary.
Explanation: Internal summaries are best used when the information within a specific main point of a speech was complicated.
It is a quick review of what a speaker has just said in a main point or sub point; used to help an audience remember a particularly detailed point.
Answer:
D. Wind, rain, and ice.
Explanation:
The term weathering comes from the process of rocks or other surfaces being broken down after being exposed to the elements. This refers to elements such as wind, rain, and ice. All of these things can slowly break down anything left outside or exposed to the weather. The other answers are incorrect because weathering only refers to the processes created by the atmosphere. Things like erosion, time of day, and volcanoes are unrelated to the atmosphere and therefore not weathering.
Its was there main source of food and water. And when it flooded in the flood season its gave farmers soil the grow on.