able to combust
The airplane fuel is highly combustible.
crude oil
oil which has not been processed for typical use
Venezuela exports large quantities of crude oil to the United States.
disadvantages
a situation or circumstance which makes something difficult to achieve
Not having studied for the exam was a disadvantage for the student's success.
discarded
to throw away
The idea was discarded as being impossible to believe.
disruption
an interruption in the normal course of an activity
The student's interruptions were a disruption for the class.
drawbacks
an unfavorable situation or feature
Unforseen drawbacks created delays for the completion of the project.
drilled
to open a hole with a rotary motion
A hole was drilled in the wall to hang the picture.
economical
not costing much money
The tickets to the basketball game were surprisingly economical.
explosives
a substance which can explode or break apart violently
The terrorists used explosives to destroy the governmental building.
ferns
a type of plant with long, thin leaves ferns are popular houseplants.
fossil fuel
a type of fuel which has been formed by the remains of plants or animals
Fossil fuels such as natural gas are commonly burned to heat houses in the wintertime.
implicated
to involve as a consequence through inference
A man was implicated in the crime thanks to the neighbor's testimony.
manipulation
to change something, either a skillful or deceptive manner
The manipulation of the data gave the professor the result she wished for.
Mesopotamians
people who occupied the region in southwest Asia between the Tigris and Euprhates rivers.
The mesopotamians created a powerful society along the Tigris River.
refrigerants
a substance used to reduce the temperature of something
Industrial refrigerators use large quantities of refrigerants to keep the food cool.
renewable
capable of being renewed
Many countries are searching for forms of renewable energy.
scarcity
the state of being scarce
The scarcity of food lead to starvation across the country.
sediment
a substance which settles at the bottom of a liquid
The coffee grounds settled as a sediment at the bottom of the coffee cup.
synthetic
a product which has been made artificially synthetic oil is often used in high mileage cars.
tar
a thick, heavy brown or black liquid
Many dinosaurs died when they became trapped in pits of tar.
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