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100

The formula for water.

What is H2O?

100

A heated glass building for growing plants.

What is a greenhouse?

100

Where rooms are rented and meals are served.

What is a boardinghouse?

100

A house of prostitution.

What is a cathouse?

100

It makes ocean water different than fresh water.

What is salt?

200

The temperature where water freezes.

What is 32 degrees?

200

A tower with a very bright light to guide ships at night.

What is a lighthouse?

200

A place for confining prisoners.

What is a jailhouse?

200

Amusement park building with devices to surprise patrons walking through.

What is a fun house?

200

When clothes get smaller after washing, especially hot water.

What is shrinking?

300

This desert plant doesn't require a lot of water.

What is cactus?

300

A shelter for dogs or people who are in trouble.

What is a doghouse?

300

An outdoor structure used as a toilet.

What is an outhouse?

300

Built on large branches for children to play in.

What is a treehouse?

300

The longest river in the world.

What is the Nile?

400

An overflow of water in an area that's usually dry.

What is a flood?

400

A home occupied by ghosts

What is a haunted house?

400

A shelter for poultry.

What is a henhouse?

400

A small box made for birds to nest in.

What is a birdhouse?

400

He made an ark to escape the great flood.

Who was Noah?

500

The Yukon is the chief river in this state.

What is Alaska?

500

A building where ice is store.

What is an icehouse?

500

A publicly supported institution for paupers.

What is a poorhouse?

500

Children go here to learn.

What is a schoolhouse?

500

A waterfall that's a favorite spot for honeymooners.

What is Niagara Falls?