Raj made the timeline below to show the progression of thinkers who developed theories about Earth’s place in the universe. ? à Copernicus à Galileo à Newton

Which thinker belongs at the beginning of Raj’s timeline?
Aristotle
Kepler
Ptolemy
Thales

answer: land bridge theory. land bridge theory held that shifting portions of dry land explained the finding of identical species on different continents. plate tectonic theory eventually eliminated the land bridge theory.

sulfur dioxide

explanation: acid rain is caused by a chemical reaction that begins when compounds like sulfur dioxide and nitrogen oxides are released into the air. these substances can rise very high into the atmosphere, where they mix and react with water, oxygen, and other chemicals to form more acidic pollutants, known as acid rain.