Which set of conditions allows liquid water to exist on earth? a. strong magnetic fields and lunar tides b. comet crashes and volcanic eruptions c. moderate temperatures and strong gravity d. hydrogen bonds and moderate distance from the sun

C. Moderate temperatures and gravity helps liquid water to exist on Earth.

For liquid water to exist on the planet Earth, right atmospheric pressure, temperatures, and gravity is essential to maintain everything under control.

Gravitational force of attraction exists on Earth which holds anything towards the core of the planet. Heavy temperatures cause greenhouse effect but moderate causes things to be in proper place. Very less temperatures solidify the liquids. So, be it liquid water or land, gravitation and moderate temperatures have the capacity to helps liquid water to exist on Earth.

for e2020. the answer would be some directions from the mountain range so we can find mt. whitney. to locate which direction is north, you should use a   compass. this would not only find mt. whitney, but also becuase of this long paragraph you would get points because it's not like anyone actually reads your work becuase once they read the first sentence it sounds dumb enough to not read becuase i'm not good at answering this but the answer is compass for your benefit.

for e2020 ; -;

question

which are human systems?

the amazon rain forest

the appalachian trail

the george washington bridge

the himalayas

the hoover dam

the north american free trade agreement