Overcoming Earth's Obstacles

A straight line is the simplest way to connect Point A and B. Yet it is frequently problematic because of ________

• engineers

• Earth's varied geography

• different water bodies like rivers and lakes

• beautiful forests

Three factors to consider before deciding what type of bridge or tunnel to build...(choose all the correct answers)

• what needs to be transported

• the amount of money a country can afford

• the distance to be traversed

• the nature and composition of soil at the site

_________ are less vulnerable to weather and can carry more weight.

• Bridges

• Only beam bridges

• tunnels

• aquaducts

There are _____ main types of bridges.

• two

• three

• four

• five

________is the simplest and most common type of bridge.

• The Ben Bridge

• The Boat Bridge

• The Beam Bridge

• The Bean Bridge

Beam bridges are often used for __________

• weak surfaces

• travelling so long distances

• economical constructions

• short spans of distance

Who first built the arch bridges?

• Ancient Romans

• Tribes around the world

• Ancient Greeks

• Aboriginals Australians

The weight of the arch is supported by (a)   in an arch bridge.

Aqueducts are bridges _________

• that carry waste materials

• that carry oil

• that carry water

• that carry boats an ships

The suspension bridges are not used to traverse long distances.

• TRUE

• FALSE