This enormous building (covers, cover) three blocks.

Twenty-three galleries (offers, offer) visitors information and entertainment.

The different showrooms (deals, deal) with various aspects of air and space travel.

As you can see, the exhibits (features, feature) antique aircraft as well as modern spacecraft.

In another area, a theater (shows, show) films on a five-story-high screen.

A planetarium (is, are) located on the second floor.

Projectors (casts, cast) realistic images of stars on the ceiling.

Some tours (is, are) conducted by pilots.

 In addition, the museum (houses, house) a large research library.

A tidal wave, despite its name, (is, are) not caused by the tides.

 Earthquakes beneath the sea (causes, cause) most tidal waves.

A network of warning signals (alert, alerts) people in coastal areas of an approaching tidal wave.

The tremendous force of tidal waves sometimes (causes, cause) great destruction.

Walls of earth and stone along the shore (is, are) often too weak to protect coastal villages.

 Some tidal waves, according to this encyclopedia article, (travel, travels) more than five hundred miles an hour.

Tidal waves in the open ocean generally (do, does) not cause much interest.

The height of tidal waves there often (remain, remains) low.

However, waves up to one hundred feet high (occur, occurs) when tidal waves hit land.

 The scientific name for tidal waves (are, is) tsunamis.