When does a solar eclipse occur? When the Sun passes between the Moon and the Earth and blocks the moon. When the Moon passes between the Sun and the Earth and blocks the sun. When too many CMEs are created in one day. When the Sun is not producing enough energy.

As seen in a us weather map, the h (or high) and l (or low) symbols indicate regions where surface air pressures are high or low, respectively, compared to surrounding areas. an h is plotted where the air pressure is highest and an l is plotted where the air pressure is lowest. proceeding outward and away from the center of a high pressure system, the air pressure "