As a rough estimate, there is 1x1012 metric tonnes of fossil (carbon) fuels on Earth. In 2013 it was estimated that 1x108 metric tonnes of carbon was burnt. Assuming that we continued to burn carbon at this rate, calculate how long the fossil carbon will last.

i don't see a text, but i am gonna assume this *orbit* the curved path, usually elliptical, described by a planet, satellite, spaceship, etc., around a celestial body, as the sun.

water and alcohols have similar properties because water molecules contain hydroxyl groups that can form hydrogen bonds with other water molecules and with alcohol molecules, and likewise alcohol molecules can form hydrogen bonds with other alcohol molecules as well as with water.