organized way of using evidence to learn about the natural world; also, the body of knowledge that scientists have built up after years of using this process
using logic to arrive to a specific conclusion based on a generalization or premise
Sometimes, preliminary results that capture news headlines are controversial because they have not been widely tested and accepted by peer review. They are not yet considered reliable, and can be thought of as tentative science or frontier science.
consists of data, hypotheses, theories, and laws that are widely accepted by scientists who are considered experts in the field under study.
scientific hypotheses and results that are presented as reliable without having undergone the rigors of peer review, or that have been discarded as a result of peer review, are considered to be unreliable science.
compounds that contain at least two carbon atoms combined with atoms of one or more elements
high quality matter
highly concentrated, typically found near earths surface, and is useful to humans as an important resource (coal, gasoline, aluminum can)
low quality matter
not highly concentration, often found in deep ocean or atmosphere or underground and has little potential for important resource
law of conservation of matter
states that matter is neither created nor destroyed, only changed in form
moving energy; contains mass and velocity
ex: wind, flowing water electricity
--> another form is heat
radiation consisting of waves of energy associated with electric and magnetic fields resulting from the acceleration of an electric charge
law of conservation of energy/first law of thermodynamics
when energy is converted from one form to another in a physical or chemical change, no energy is created or destroyed
second law of thermodynamics
when energy is changed from one form to another, some useful energy is always degraded into lower quality energy (usually heat)
positive feedback loop
Situation in which a change in a certain direction provides information that causes a system to change further in the same direction. ex: vegetation continues to decrease and decrease, polar ice continues to melt
negative feedback loop
an opposite action to what is occurring in the body to regain homeostasis, ex. if body temperature rises too high, body tries to lower it
Complex systems often show time delays between the input of a feedback stimulus and the response to it.