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4th Grade Rocks and Minerals
Transcript of 4th Grade Rocks and Minerals
Rocks and Minerals
What is a Mineral?
A mineral is always a solid material with particles arranged in a repeating pattern.
properties of minerals!
streak is the color of the powder left behind when you rub a mineral against a white tile.
luster describes the way the surface of a mineral reflects light.
HArdness is a mineral's ability to resist being scratched
The Mohs scale of hardness!
How are minerals used?
Halite is the mineral name for table salt!
cuprite is the mineral that we get copper from.
What are rocks?
rocks are material that is made up of one or more minerals.
unlike minerals, rocks are not crystals.
igneous rock is rock that forms when melted rock hardens. Remember that Lava is melted rock!
lava cools and hardens too quickly for large mineral crystals to form.
sedimentary rock is formed when layers of rock are squeezed together over a long time.
cookies that have been flattened and baked are a great way to model sedimentary rock because sedimentary rock forms from pressure and heat
sedimentary rock, like limestone, can even have pieces of seashells in it because moving water helps to deposit new sediment.
Look at pumice and obsidian.
If we had equal sized pieces of both, which one would weigh more? why?
because pumice has tiny holes, caused when gases escaped during the cooling process, it will weight less than a piece of obsidian of equal size.
rocks and minerals are different!
a rock changed by heat or pressure, but not completely melted
Only Sedimentary rock has fossils.the pressure and heat are too great in both igneous and metamorphic rock for there to be fossils!
Imagine you are going to turn this graham cracker into a crust.
how would you do it?
just like the earth does with all kinds of rock (igneous and metamorphic included) you would have to crunch it up and put pressure on it to create a thin layer for a pie.
The Rock Cycle!
pattern of slow changes of rock from one form to another!
as you can see, there are many different paths a rock can take in its life!