1 Drainage basin-the area of land drained by a river. 2  Catchment area-the area within the drainage basin. 3  Watershed-the edge of highland surrounding a drainage basin.4  It marks the boundary between two drainage basins. 5  Source-The beginning or start of a river. 6  Confluence-the point at which two rivers or streams join. Watershed-the edge of highland surrounding a drainage basin. 2  It marks the boundary between two drainage basins. 3  Source-The beginning or start of a river. 4  Confluence-the point at which two rivers or streams join.
Dangerous levels of radiation in space could bar astronauts from a mission to Mars and limit prolonged activity on the moon, experts now caution.However, more research could reveal ways to handle the risks that radiation poses to space missions.The magnetic field of Earth protects humanity from radiation in space that can damage or kill cells. Once beyond this shield, people become far more vulnerable.owever, more research could reveal ways to handle the risks that radiation poses to space missions. The magnetic field of Earth protects humanity from radiation in space that can damage or kill cells. Once beyond this shield, people become far more vulnerable.
How long does it take the Moon to travel from one phase to the next? Suppose that the Moon spun twice on its axis during each orbit around the Earth. How would study of the Moon from the Earth be easier? If the Moon is tilted only slightly with respect to the Sun, do the lunar poles receive nearly constant sunlight? Wow! More Moon questions! Okay, here goes... There are only two types of regions on the Moon's surface. Dark regions on the Moon are called maria. They are smooth, flat plains with few craters. The light-colored highlands are hilly and are covered with craters. The U.S. Navy has created a web page where you can find the moon phase for any day in years 1800-2199. Check it out! The time between 2 new moons is 29.5 days. Say there are 8 phases of the Moon, New Moon, Waxing Crescent, First Quarter, Waxing Gibbous, Full, Waning Gibbous, Last Quarter and Waning Crescent. So that's 3.69 days from one phase to the next. We can only see half of the Moon from Earth.