Answer:
This fundamental structural unit consists of a silicon cation (black in photo) surrounded by four oxygen anions (red in photo), giving it four negative charges. It is found in all silicate minerals (ie. amphibole, olivine, pyroxene, quartz, feldspar, etc.). The silica tetrahedra may be arranged in chains (ex: pyroxenes), double chains (ex. amphiboles), sheets (ex: micas), and frameworks (ex: quartz, feldspars), forming the basic structure of the planet.
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I would say at night, when it's cooler. At night, desert temperature lowers due to the lack of water. Deserts cannot support much vegetation, so at night the sand loses all of its heat, making it colder. Sand is a major reason why deserts are hot.
Answer: subduction
Explanation: the oceanic plates sliding under continental plates form volcanoes
Coastal areas that are near warm ocean currents are more likely to experience warmer weather.