The harvesting of animals or cash crops for commercial reasons.

The means by which energy is cycled through the biosphere

excess water that can’t be absorbed by the ground

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Of or concerning a trait or characteristic, property.

Relating to or expressed as a specified or indefinite number or amount.

A tentative explanation that accounts for a set of facts and can be tested for further investigation. Earth’s Systems Chlorophyll: Any of a group of green pigments essential in photosynthesis.

The quantity of something per unit measure, especially per unit length, area, or volume. The mass per unit volume of a substance under specified conditions of pressure and temperature.

that part of the energy in a substance that can be released by a chemical reaction

The energy of a particle or system of particles derived from position, or condition, rather than motion. A raised weight, coiled spring, or charged battery has potential energy.