Answer:
Convection is a type of heat transfer that only happens in liquids and gasses. Convection happens when there is a difference in temperature between two parts of a liquid or gas.
Explanation:
Answer:
Because the Earth's gravity acts on the atmosphere and holds it down, just as it does all other objects. The weight of the atmosphere is estimated to be about 5.75 quadrillion (5,750,000,000,000,000) tons. Air pressure is the "push" of the atmosphere on the Earth's surface.
It's B, because a negative charged Ion is an anion. And since it's 1- ,one valence electron is been added to H. So it has 2 valence electrons.
