Weather
The amount of water vapour in the atmosphere
what is humidity?
dark material made from dead plants and animals
what is humus
this planet has the shortest revolution
what is mercury
this change of matter can be reversed
what is a physical change
a ramp is an example of this simple machine
what is an inclined plane
wind is formed when
warm air rises and colder air rushes in to replace it
the thin outer layer of the earth
what is the crust
saturn's largest moon
what is Titan
this happens to the mass of water when it freezes
what is stays the same
this force pulls objects towards the center of the earth
what is gravity
Two devices used to measure wind direction
what are windvane and windsock
rock formed from molten material that cools
what is igneous rock
this name is given to jupiter, saturn, neptune and uranus
what are gas giants
plants need this gas in order to make food
what is carbon dioxide
the point where the lever moves
what is the pivot
the symbol below represents
what is rain
the liquid part of the earth
what is hydrosphere
this planet is known as the evening star
what is venus
these gases are used in balloons to cause them to float
the twisting force which causes an object to rotate
what is torque
high, wispy clouds
what are cirrus clouds
this process creates soil
what is weathering
a large collection of stars, gas and dust
what is Galaxy
this happens to the volume of water when it freezes
what is increases
this force caused meteors to heat up as they enter the atmosphere
what is friction