What does the angle of parallax determine

Which area on the map would be most likely to have the most oil exploration in since the start of the 21st century? a) b) c) d) plz me

Simple astronomical telescope the objective lens has a focal length of 75 cm and that of a piece of 5cm of the lenses are 18 cm apart when will be final image of a distant object before

If scientists only detect p waves in a certain layer of earths interior what does that tell us?