Earth has an atmosphere with the right mix of gases oxygen and carbohydrates​

What is the role of institutions in society - do they perform positive functions, or simply work in the interests of the powerful and against the powerless? (a related question here is why do our life chances vary by class, gender and ethnicity)

Lava and other matierls luanced from a volcano and into the air are referenced as

What was governor faubus’s public stance on integration of central high school?