Which of the following forces causes comets to regularly return to the inner solar system after being gone for many years? a. friction b. electromagnetic force c. magnetism d. gravity

Which of the following are guidelines to follow for obtaining accurate observations

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

Frequency of electromagnetic waves that a radio station is assigned. what do you call this type of wave?