How can scientists test their ideas about the origin of the universe if they cant physically interact with or study it

What is meant by the statement" the melting poin of glycerine is 13 degree celsius

Why is the energy that results from a roller coaster's position at the top of a hill referred to as potential energy?

Isobars are lines of constant or equal pressure on a weather map. they can be used to find areas of low or high pressure over a broad area, and they can tell us how intense the system may be. on weather maps, you may have noticed areas that have a large l or h over a region with lines circling around them. the l stands for low pressure and h stands for high pressure. the lines circling them are isobars. check out the pressure system and isobars over georgia and florida. what is the present weather in this area ? a) clear and sunny b) cold and cloudy c) changing weather d) lots of precipitation