One of the first known metals to be used for tools and weapons.
What is copper?
100
This period lasting from about 1 million BC to 3000 BC was a time during which people used stone, bones, and wood to make tools.
What was the Stone Age?
100
This device allowed most of the heavy farming work - like turning the soil - to be done by strong animals such as oxen.
What is a plow?
100
This period was a time in which human and animal muscle power was replaced by machines.
What is the Industrial Revolution?
100
Early towns sprung up in the west along rail lines to provide trains with this much needed engine requirement.
What is water?
200
This alloy was created accidentally by the Ancient Egyptians by mixing copper and tin.
What is Bronze?
200
This term refers to people who live their lives wandering from place to place while they hunt for animals and gather plants and fruit used for food.
What are nomads?
200
This device was usually placed next to a running body of water and turned a mill for grinding grain into flour.
What is a water wheel?
200
English metalworker Abraham Darby made iron that was very pure and very strong by heating it with this carbon-like substance that comes from coal.
What is Coke?
200
As steam engines began to be replaced by these types of engines, towns along western rail lines eventually began to dry up and become ghost towns.
What are diesel engines?
300
The process used to melt down ore to where it takes on a liquid form, thus burning away any impurities.
What is smelting?
300
This "era" saw the introduction of the oxen-pulled plow which, Farmers used to grow and harvest plants in a dependable and timely manner.
What is the Agricultural Era?
300
This basic communication innovation allowed people to record their ideas and make them permanent.
What is writing?
300
Many of the new machines during the Industrial Revolution were powered by this substance, usually created by heating water to very high temperatures.
What is steam?
300
To help solve the ethical dilemma of polluting the environment, these vehicles combine the engine of a conventional vehicle with the battery and electric motor of an electric vehicle.
What are Hybrid Electric Vehicles (HEVs)?
400
This metal eventually replaced bronze as the primary metal used in toolmaking because it was available in more areas and produced more durable tools and weapons.
What is iron?
400
This architectural work of engineering served as a channel to carry water into cities using a slowly decreasing downward gravitational pull.
What is an Aqueduct?
400
Taking writing a step further, this invention developed by Johan Gutenberg made distributing the written word easier by speeding up the copying process.
What is the printing press?
400
Cities and towns built these structures to house and teach the children of parents working in factories.
What are schools?
400
This term refers to a difficult decision that a person has to make about whether something is right or wrong.
What is an ethical dilemma?
500
Working in a clay lined hole in the ground used to smelt iron, this tool was used to pump air into the coals, thus making the fire hotter.
What is a bellows?
500
This metal is obtained by mixing two or more metals together.
What is an alloy?
500
This system saw the transition of goods made by hand to goods being made by machines.
What is the factory system?
500
This term refers to the speed at which technology advances over time.
What is the rate of technological change?
500
This scientific advancement, where cells from one animal are placed into another to create an exact duplicate, can produce an ethical dilemma.