Quartz, sio2, is the most common mineral found on the surface of the earth. what is the best explanation for the fact that quartz is hard and has a high melting point as opposed to other oxides like no2 and co2?

hurricanes form when warm, moist air from the ocean surface quickly rises into the atmosphere and forms storm clouds and rain. when the clouds are formed, heat is released which warms the cool air in the upper regions of the atmosphere so that the cycle can continue. which two phases of the water cycle are repeated in this process?