Sunlight can be absorbed, reflected , or scattered before it reaches Earth's surface. About 30 percent of sunlight hits Earth directly, and 22 percent is filtered through clouds . Dust particles short wavelengths, which causes the sky to appear blue. Earth radiates heat into the atmosphere, which traps the heat in gases, causing the greenhouse effect .

Which is the best conclusion that can be drawn regarding the status of african-americans in the south in the late 1800s? a) african-americans made tremendous political, social, and economic advancements during the reconstruction era. b) passage of the 13th, 14th, and 15th amendments to the u. s. constitution guaranteed equal status and rights for all african-americans. c) the reconstruction policies enacted by the federal government were highly effective in african-american citizens transition to life after slavery. d) although african-americans had equal rights under federal law they were still economically, politically, and socially inferior to whites in the south during the reconstruction era.