stem
bridge
planes
100

what does the s stand for

science

100

what do bridges do

 to allow people or cargo easy passage over an obstacle by providing a route that would otherwise be uneven or impossible

100

what do you call the molten rock that comes out of volcano

lava

200

what does the e stand for 

engineering

200

what are a bridges pruncpals

A bridge must handle high amounts of force well to maintain stability.

300

what does m stand for

math

300

what are the 2 ends of bridges to support its wieght

abutments

400

what does t stand for

tech

400

2 forces bridges deal with

 compression and tension