4-Letter Words
The Environment
Grammar
U.S. History
World Geography
100

A flash of lightning.

What is bolt?

100

The long-term heating of Earth's climate due to human activities.

What is global warming?

100

This punctuation mark is also known as an interrogation point.

What is a question mark?

100

A devastating earthquake and fire in this city in 1906 caused $400 million in damages.

What is San Francisco?

100

In what country can you visit Macchu Picchu?

What is Peru?

200

Term for a group of wolves.

What is pack?

200

The primary greenhouse gas emitted through human activity.

What is carbon dioxide?

200

Slowly, sadly, warmly, and rapidly are all examples of this type of word.

What is an adverb?

200

This Connecticut native was a general in both the American and British armies during the Revolutionary War.

Who is Benedict Arnold?

200

Less than 5,000 square miles in area, Gambia is the smallest country on this continent.

What is Africa?

300

To hit hard, or a snail-like organism.

What is slug?

300

The process by which plants use sunlight to create food from carbon dioxide and water.

What is photosynthesis?

300

A comma used after the second to last item in a list of three or more items.

What is an Oxford comma?

300

In 1817, Congress divided a territory that became these two states that are practically mirror images of each other.

What are Alabama and Mississippi?

300

What country has the most natural lakes?

What is Canada?

400

Another name for a killer whale.

What is an orca?

400

Starting at ground level and extending about 6 miles above sea level, this is the lowest level of our atmosphere.

What is the troposphere?

400

In the sentence "Sailing is fun," sailing is this, also called a verbal noun. 

What is a gerund?

400

In 1945, scientists in this state witnessed the detonation of the world's first atomic bomb.

What is New Mexico?

400

How many U.S. states touch the Pacific Ocean?

What is 5? (Alaska, Washington, Oregon, California, Hawaii)

500

Partially opened; a door, for example.

What is ajar?

500

Los Angeles is known for having a thick layer of this brown haze over its skyline, a product of air pollutants reacting with sunlight.

What is photochemical smog?

500

The "in 1969," in the sentence "Neil Armstrong made history as the first man to step on the moon in 1969" is an example of what common grammar mistake?

What is a misplaced modifier?

500

In the first census, 1790, this was the most populous state.

What is Virginia?

500

Brazil shares a border with every South American country, except these two. 

What are Chile and Ecuador?

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