How is earth atmosphere like and dislike an ocean

You mean: how is earth's atmosphere like and unlike an ocean?

Some similarities: they both contain water: ocean in a liquid form and atmosphere as water vapor and oxygen, although oceans have relatively little oxygen (but enough for the fish to catch).

Major difference is that the main substance in the atmosphere is various gasses, while the main substance in the ocean is water in liquid form.

In financial aspects, a depression is a sustained, long haul downturn in monetary movement in one or more economies. it is a more extreme monetary downturn than a recession, which is a slowdown in financial action through the span of a typical business cycle. a depression is an irregular and extreme type of recession. so depression is always followed by recession but it is not correct to state that a depression always follow a recession.