ILearn7B (Th.8, less.1&2)

secure from threat of danger, harm, or loss

able or likely to cause harm or injury

“not environmentally harmful.”

renewable source of energy that generates power by using a dam or diversion structure to alter the natural flow of a river or other body of water.

energy derived from natural sources that are replenished at a higher rate than they are consumed

a condition or circumstance that puts one in a favorable or superior position.

a flat construction resembling a window, built with technology that allows it to passively harvest the heat of the sun

the process by which the wind is used to generate mechanical power or electricity.

the use of nuclear reactions to produce electricity

costing very little; relatively low in price; inexpensive

costing a lot of money

found mainly in underground deposits and widely used as fuel.

an unfavorable circumstance or condition that reduces the chances of success or effectiveness.

the introduction of harmful materials into the environment

a hydrocarbon mixture consisting primarily of saturated light paraffins such as methane and ethane

energy comes from sources that will run out or will not be replenished in our lifetimes

the use of the sun's energy either directly as thermal energy (heat)

a viscous liquid derived from petroleum