<span>The minerals that make up </span>rocks<span> have defined chemical </span>compositions<span> and rigid atomic structures. When sunlight strikes the </span>rock's<span> surface, the </span>composition<span> and atomic structure of the different minerals control the wavelengths they absorb or reflect.</span>
The composition of a rock is determined by the
minerals it is made of . Correct answer: C. Almost all rocks made of minerals, but different rocks contain different mixtures of minerals. There are three main groups of rocks: sedimentary, igneous or metamorphic.
Dune deflation hollows are where wind has removed sand down to a level where a layer of particles too heavy for the wind to move (an armoured surface) stabilises the sand and prevents the surface being lowered further.
A crevasse is a deep, wedge-shaped opening in a moving mass of ice called a glacier. Crevasses usually form in the top 50 meters (160 feet) of a glacier, where the ice is brittle.
a mass of rocks and sediment carried down and deposited by a glacier, typically as ridges at its edges or extremity.
