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.
The Moon is on average, about 240,000 miles from Earth, so it's a tricky journey. The first men on the Moon were part of the Apollo 11 mission. They blasted off aboard a Saturn V rocket, which propelled them out of Earth's gravity.Rocket sections. The section of the spacecraft carrying the astronauts separated from the rocket, and took them to the Moon.he Moon is on average, about 240,000 miles from Earth, so it's a tricky journey. The first men on the Moon were part of the Apollo 11 mission. They blasted off aboard a Saturn V rocket, which propelled them out of Earth's gravity. Rocket sections.