The answer is B. A satellite is any object that revolves around another object, whether that be a natural satellite like an asteroid or a man-made object like a radio satellite.
Converting a number to its scientific notation with two significant figures gives 5.5x10^3. Scientific notation is used to denote large or complicated numbers more easily. It basically involves shortening the number by moving the decimal point. A "10^n" is then included to make sure that the number is still the same. Sometimes, writing the scientific notation also requires rounding off the number.
Geysers, hot springs, and bubbling mud are landscape features that are produced by the source of energy known as geothermal.
Geo means that it is referring to the ground, soil, the Earth, and thermal relates to temperature. So this means that these features have originated due to the temperature of the inner parts of the Earth itself. These have many medicinal benefits and are often found in spas.