What causes Earth to orbit the sun ?

All motion is caused by force? true or false

If c + di is a point on the circle, then | c + di |=

According to the passage, which of these is true about gray water systems? a) gray water systems use plants that require less water. eliminate b) gray water systems require the use of less fossil fuels. c) gray water systems reduce the amount of fresh water used. d) gray water systems reduce the amount water used by shower heads.