6. this component of earth's physical systems is the region on earth that can sustain life. (1 point)the hydrosphere
the lithosphere
the atmosphere
the biosphere

7. the layer of solid ground that makes up all of earth’s continents is called (1 point)
the hydrosphere.
the lithosphere.
the atmosphere.
the biosphere.

8. what are the stages of the water cycle?
(1 point)
evaporation
precipitation
condensation
run-off
all of the above
a and c only

9. true or false: knowledge of geography saved lives during the "christmas day tsunami." (1 point)
true
false