Hypothesis: An educated guess on the natural world possibilities
Theory: An explanation of the natural world aspect
Law: An aspect of how the natural world reacts under a specific circumstance
Hypotheses, theories, and laws all have natural world tests in common. Each of them are trying to provide the steps to guarantee a valid experimentation. You cannot have a valid experimentation without each of these. However, fact is also a need.
A trapezoid is a type of quadrilateral that has an opposite pair of parallel sides; at lest, that definition seems pretty accurate to me.
Water shortage, domestic waste, coastal erosion
The amount of trees in a given location?
It is a massive, irregularly shaped slab of solid rock, generally composed of both continental and oceanic lithosphere.