classifications –rocks.ppt
TRANSCRIPT
Classifications – how to separate different objects into groups
ROCKING ROCKS!
Describe an animal
Using a Branching Keys
Which Dinosaur?
Create a key for 4 people in the room
Describe the rock
Rock Colour Size of grains
Are the grains shiny?
Do the grains fit together?
Sketch of rock texture
Crystals in rocks
shape of grains, and whether or not they interlock
size (or sizes) of the grains
how many different kinds of mineral you can see.
Which ones do you think will let in water
Make a key for the rocks
Mohs’ scale of hardness
Acid or Alkali?
Rain is naturally acidic because of carbon dioxide
MANMADE Acid RAIN
WHY IS THERE ALWAYS SCAFFOLDING ON Monuments?
Limestone pavement
Making your statue
Chemical Weathering
Acid Rain
Porous rock
• Some rocks take in water
• But only the ones with the rounded grains• We will do an experiment next lesson to prove
it.
• This can damage the rock and ruin your statue
Freeze thaw action
Where would you place your statue?
The best rockWhat is the best rock for making a statue that will last for
years?1)There are several features of the rock that you should
consider:2) What colour and texture will the rock have when the statue is
made?3) How difficult will the rock be to carve into shape?
(hardness of the rock)
4) Will the rock be damaged by acid rain? If so, will this matter?5) What will happen to the statue when it gets wet?6) Will the rock be damaged by changes in temperature?
Design your statue
• Explain the science behind your decision
FREEZE-THAW
BIOLOGICAL WEATHERING PHYSICAL WEATHERING
Chemical WEATHERING