Demand curve is the ratio of demand (of whatever) to its price. It indicates the inverse relationship of what's demanded and the price
Lava<span>: Magma that reaches the earth's surface is called </span>lava<span>. It may be </span>acidic<span> or </span>basic<span>. </span>Acidic lava<span> is viscous, is lighter in color and has higher silica content. </span>Basic lava<span> is non-viscous, is darker in color and has lower silica content.</span>
Concrete is not a crystal.
Marine waters cover 70.8% of the earth’s surface. And, if we substract the 5.5% area of the continental shelf, 65.3% of the earth’s surface is occupied by continental slope and rise, and deep-sea parts (data after Dietrich and Kalle 1957). The deep sea can be subdivided into several topographical units. There are deep-sea grabens<span> (15 in number), which cut deeper than 6,000 m. Deep-sea grabens are restricted to tectonic active regions near the foot of continental slopes.</span>
