Ageologist finds a mineral sample alongside a swift flowing river. she determines the mineral is a type of quartz. which is true about this mineral?
a. it cannot be classified without knowing it's end use
b. it can be classified as a silicate mineral
c. it can be classified as a carbonate
d. it can be classified as a metallic ore
need the answer

Two friends at different locations want to communicate with each other by sending low energy signals. which of the following methods can they use to communicate? a) produce x-rays using colliding electrons and send them to radios, which capture sound b) send messages using infrared radiation, which travel in the form of waves c) send radio waves through intervening media like radio and television d) produce sound waves using microwaves from heated objects

Light waves travel than sound waves.

How many moles of co2 are produced during the complete combustion of 3.6 moles of c2h6