The graph below shows the radioactive decay of an isotope of strontium Based on the graph, what is the half-life of strontium?
56.2 years
14.05 years
84.3 years
28.10 years

The process by which liquid water changes into water vapour is called what ?

According to speculation and study, what will happen to the global birth rate in about 40 years? (1 point)

What can happen to solar radiation when it enters earth’s atmosphere? check all that apply. it is absorbed by earth. it is reflected by clouds. it is reflected by glacial ice. it is condensed into visible light. it is amplified by water molecules.