Answer to Question 1
Answer: Historical records can record dates of crop harvests, droughts, floods, and other extreme weather events that could affect the population.
Answer to Question 2
Answer: Solar radiation in the form of shortwave radiation penetrates the atmosphere and warm's the Earth's surface. The shortwave radiation can easily penetrate the atmosphere, including the greenhouse gases. The Earth later re-emits the heat in the form of longwave radiation. Longwave radiation cannot penetrate the greenhouse gases in the atmosphere, resulting in warming of the near-surface atmosphere.
The declining age of menarche over the past 150 years has been measured in many European countries,
Rate of Residential Change, Past Year, in the United States
The recent mass upheavals in Tunisia, Egypt, Libya, Yemen, and Syria gave political scientists a cha
Average Global Temperature Rise over the Past Century
What are examples of ideal forms?
Under ideal conditions, a single cell of the bacterium E. coli would divide every 20 minutes to ...