The phases of the Moon are caused by the revolution around the Sun the Earth (1) Earth's revolution around the sun
(2) Moon's revolution around the Earth
(3) Moon carving distance from the Earth
(4. Sun's varying distance from the Moon

Can someone me choose a broad topic and area of focus i am really doing this as a tally to see which one most people pick ok water pollution global warming endangered species atmosphere for the !

Which of the following events did not occur as a result of china’s open-door policy? a. trade between japan and china was encouraged. b. all countries were given equal access to chinese ports. c. foreign influence in china increased. d. the influence of the communist party weakened.

What is the border between layers a through f and layer g called?