Which scientist first named humans homo sapiens

Distance that the transcontinental railroad covered from omaha to san francisco.

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.

Some of the incoming solar radiation is absorbed by the floor. identify the type of electromagnetic energy reradiated by the floor