chemical changes
We ............. food in the oven.
bake
A ........................ is a combination of all forces moving on an object.
net force
............................... can harm our ears.
Noise pollution
...................... are like giant buring fire balls giving off light and heat.
Stars
Fire produces ................... and ...................
smoke and ash
.................... is a force that works in the opposite direction of motion to stop moving objects.
Friction
................... is much softer than shouting
Whispering
........................ are groups of stars in the sky that seem from the Earth to form a pattern.
Constellations
........................... is a process which forms clouds.
Condensation
.................... occurs when a metal object is exposed to water and air.
rusting
forces are invisible, we show forces on diagrams by drawing ....................
arrows
..................... is the number of sound waves over a given amount of time.
Frequency
constellations helped keep track of the year like a ......................
calendar
water pollution is created by throwing .................., ..................., and ..................... into seas and rivers.
garbage, chemicals, and sewage
.................... and .................. are examples of polymers.
Wool and rubber
A ........................ is used to measure the size of a force acting on an object.
spring scale
........................ is moving back and forth very quickly.
vibration
........................... constellation can be seen in the spring and it has a double star called Regulus.
The Lion
...................... is the process in the water becomes clean as it penetrates the soil.
Infiltration
When we mix ................... with .................. , we call this an irreversible mixture.
vinegar and baking soda
.................. friction keeps the object in place.
Static
........................ is the speed at which an object vibrates, but ................... is the loudness of a sound.
Pitch, volume
The Great Dog constellation contains the brightest star in the sky which is called ......................
Sirius
When ................. forms, water goes from a gas state straight to a solid state and skips the liquid state.
Frost