What is the molar ratio of hydrogen to oxygen in this equation? 2H2 + O2 → 2H20

A. 1:1
B. 1:2
C. 2:1
D. 2:2

When the earth was formed and cooled, why did nickel and iron end up in the center of the earth while basalt and granite ended up in the outer layers

Explain what happens at the saturation point when adding salt to water at room temperature.

The human activities in two locations are described below: location a: rampant use of plastic containers location b: excessive use of pesticides and fertilizers which statement is most likely true? location a will have poor air quality because plastic is biodegradable. location a will experience water scarcity because plastic absorbs moisture. the population of honeybees will increase in location b because production of crops will increase. the population of fish in location b will decrease because the water is contaminated.