Coal, oil, and gas consist largely of carbon and hydrogen. The process that we call "burning" actually is chemical reactions with oxygen in the air. For the most part, the carbon combines with oxygen to form carbon dioxide (CO2), and the hydrogen combines with oxygen to form water vapor (H2<span>0). In both of these chemical reactions a substantial amount of energy is released as heat. Since heat is what is needed to instigate these chemical reactions, we have a </span>chain reaction<span>: reactions cause heat, which causes reactions, which cause heat, and so on. Once started the process continues until nearly all of the fuel has gone through the process (i.e., burned), or until something is done to stop it. Of course, the reason for arranging all this is to derive the heat.</span>
Not a characteristic of living things is organisms only need water.
The answer is B cause earth moon and sun combined together creates the greatest gravitational pull and makes tides.
Cladodes<span> (also called cladophylls or phylloclades) are shoot systems in which leaves do not develop; rather, the stems become flattened and assume the photosynthetic </span>functions<span> of the plant. In asparagus ( Asparagus officinalis; Asparagaceae), the scales found on the asparagus spears are the true leaves.</span>
