To prevent the wood on bridges from breaking, people would cover them so that they wouldn't __________.
get wet
100
The moon's light is just a reflection of the _________.
sun
200
Sounds travel best through __________.
a. solids
b. liquids
c. air
solids
200
When light travels around an opaque object, it creates a ____________ on the ground.
shadow
200
This type of heat energy explains how hot air rises and cool air falls (like the hot air from the toaster making the paper spiral spin.)
a. conduction
b. convection
c. radiation
convection
200
This kind of bridge looks just like the road but with pillars to support it.
beam bridge
200
A red apple is absorbing all of the colors of the rainbow except __________.
red
300
The highness of lowness of a sound is called the __________. (Like the highness of a bird's chirp and the lowness of a lion's roar.)
pitch
300
Light bouncing back off of an object is a ________________.
reflection
300
This type of heat energy explains how your hands become hot while holding a hot drink.
a. conduction
b. convection
c. radiation
conduction
300
This bridge looks like it could be hanging from the sky.
suspension bridge
300
Who invented the light bulb?
Thomas Edison
400
This word refers to when sound bounces off a surface and travels back to where it is made
echo
400
White light travels through a prism and refracts into a ____________.
rainbow
400
True or False: An object with more molecules has more heat energy than an object with fewer molecules.
true
400
This bridge is often used for train travel.
trestle bridge
400
Pontoon bridges used to be made from _____________. Now they are made from hollowed out concrete.
animal skins
500
Alexander Graham Bell made a telephone work by changing the human voice into ___________.
a. water
b. electric signals
c. heat
electric signals
500
This word refers to the process by which plants make food with sunlight.
photosynthesis
500
Which object has the most heat energy?
a. a lit match
b. a hot cup of coffee
c. a snowman
snowman
500
These two words describe the physics behind bridges. One word means to pull and the other means to push.
tension and compression
500
The human voice is made by the _____________ vibrating.