Why do astronauts wear space suits in swimming pools before participating in manned space explorations? F It allows them to work in a frictionless environment. G Gravity of water is similar to microgravity of space. H The load of the backpack is lightened by water, allowing astronauts to more easily practice space tasks. J Wearing a spacesuit in water simulates the weightlessness of space.

7. describe two strategies that parents can use to cope with stress. 8. describe the three types of childcare available to families. 9. what can parents do to be more involved in their children's education at home and at school? 10. which factors should a parent consider when choosing a childcare option?

Climate like that in the sahara desert have the fastest rates of weathering

Waste water from industries and domestic sources can be treated by chlorination or ultraviolet radiation. there are pros and cons to using either chlorine or uv radiation to kill harmful microorganisms. what is one reason chlorination would be preferred over ultraviolet radiation? a) chlorine only eliminates visible impurities and is ineffective against microorganisms. b) chlorine not only kills bacteria but provides a residual effect on returning microorganisms. c) uv radiation can be used only to treat drinking water and is ineffective in treating waste water. d) ultraviolet radiation is more effective