A global network of observation stations measures the round trip time of flight of ultrashort pulses of light to satellites equipped with retroreflectors.
powerful source of data for studies of the solid Earth and its ocean and atmospheric systems
The answer is B. climate is the general weather pattern of an area over many years.
There all politically incorrect
C. water systems are used for trade
every other answer choice doesn’t provide a way that humans interact with the environment, but choice c provides how humans use waterways to benefit trade.
Shanties are not the average place to stay , and are often depicted as areas of despair. However, there is increased recognition that the slums are indeed source of home for several rural impoverished people who can not manage to migrate to the affluent urban areas forthright. It is a starting point after all. Better half a pie than lack of it altogether.