16 Quartz, feldspar, and mica are silicate minerals. Silicate minerals contain atoms of silicon and oxygen and often other elements bonded together. What must be
true of silicate minerals?

Water flows along the east coast and across the western tropical pacific towards south america, while they both are directed towards that way,  el niño does not directly affect the southern flow of water along the coast. 

Answerweathering;

Answerhighlands and forests;

The answer to the first one is barometer.