What produces the retrograde motion of mars?

Is our planetary system heliocentric or geocentric

What causes days and nights? Explain with a diagram.

How much of the Sun's ultraviolet radiation reaches Earth's surface? 1. some of the ultraviolet radiation 2. most of the ultraviolet radiation 3. almost all of the ultraviolet radiation 4. none of the ultraviolet radiation 5.

He was a harsh dictator in Chile, seated in 1973. A. Peron B. Noriega C. Pinochet

During the La Nina phase of ENSO the weather in South East Asia will most likely be: a. Wetter b. Drier c. The same as always d. Cannot predict how La Nina could impact weather in South East Asia e. Colder

Which of the following is (are) TRUE in plants? a. Mitosis occurs in gametophytes to produce gametes. b. Meiosis occurs in sporophytes to produce spores. c. The gametophyte is within the flower in angiosperms.

The Gibraltar connects what two bodies of water?

Estonia, Lithuania, Ukraine, Belarus, and Moldova once comprised Yugoslavia. True False

Where do most volcanos form A) In the ocean B) Over a hotspot C) At plate boundaries

Which of these is not an environmental effect of destroying wetlands A. loss of habitat B. increased air temperature C. poor absorption of rain water D. unfiltered water