Town X and town Y are 500 km apart. A car travels from town X at 50 km/h. At the same time a van starts to travel at 30 km/h from town Y. When and where do the car and van pass each other?

d. air pressure decreases as altitude increases.

as we probably am aware that our atmosphere or air have various levels, each level has different gasses, and each gas has another porousness. at the point when the light originates from lower porousness to higher penetrability, it alters its course. with the goal that implies that when the light originates from the moon to the earth, it alters it's course a lot more occasions. it essentially implies that the state of the light piece of the moon is changed on the earth.

not copied too! hope this !

joke:

h o h o hope you have a merry christmas!

k2s for potassium sulphide