Sound, Rocks, Machines, Light

• The hands stopped the bell from vibrating.
• The bell was not shaken hard enough.
• The bell got too warm by holding it.
• The handle did not vibrate very well.

• The drum has a higher pitch than the guitar.
• The drum makes a louder sound than the guitar.
• The guitar's parts vibrate, but the drum's parts do not.
• The guitar's parts vibrate more quickly than the drum's parts.

• how light energy moves from the sun to Earth
• how sound waves can move through space
• how sound waves move through the air
• how light moves in a straight line

• The light is reflected when it goes into and out of water.
• The light is refracted when it goes into and out of water.
• The light is absorbed when it goes into and out of water.
• The light moves around the pencil when it goes into the water.

• The area had volcanoes that kept the climate warmer.
• The dinosaurs migrated from the tropics to the mountains.
• The climate long ago was hot and tropical in the mountain area.
• The dinosaur fossils were brought to the mountain area to study.

You are using a light and your hand to make shadow puppets on a wall.  What property of light makes shadows possible?

• Light is reflected from your hand onto the wall.
• Light bends around your hand as it moves.
• Light moves in a straight line and passes through your hand.
• Light moves in a straight line and cannot pass through your hand.

• The mirror has a crumpled, shiny surface that refracts light in many directions.
• The mirror has a smooth, shiny surface that reflects light in one direction.
• The mirror is a clear piece of glass that lets the light shine through.
• The mirror is a solid object that absorbs most of the light.

• The rock is made of sand.
• All rocks have quartz in them.
• The rock is made only of quartz.
• The rock is made of many minerals.

• Sound travels through the air.
• Sound travels through solids.
• Sound travels through liquids.
• Sound travels through a vacuum.

• Water flowing over the dam is used to produce electricity.
• Trees were cut down, and the wood was used to build the dam.
• Soil was moved from one place to another to help build the reservoir.
• Blocks of concrete made from rocks and minerals were used to build the dam.