There are three types of rocks-igneous, metamorphic, and sedimentary.Each rock is formed through different processes and made up of varying materials.Igneous rocks are formed through the cooling of melted materials while metamorphic rocks are formed when heat and pressure change other rocks.Sedimentary rocks are composed of pieces of rocks and minerals and even remains of animals and plants.All of these pieces are compressed and held together by other minerals.Some examples of sedimentary rocks include limestone, sandstone, and coquina.
Problem: How can one create a sedimentary rock?What takes place during the rock cycle?
Pour a spoonful of sand into a paper cup.Pour another spoonful of gravel into the same cup.
Fill another cup with a teaspoon of water.Stir in 5 spoonfuls of sugar until it is dissolved.
Pour the sugar water mixture slowly into the cup of sand and gravel until it is moistened.Pour off any excess water.
Let the “rock” dry then carefully tear the paper cup off over a piece of wax paper.
Let the “rock” sit and harden for at least 2 days.
Use a magnifying glass to observe your “rock.”Draw an illustration of what you see.What kind of rock did you make?
1 disposable cup
1/2 cup of pasta, at least three shapes and sizes (shells, macaroni, rotelle, whatever you’ve got)
2 tablespoons water
1 disposable stirrer
2 tablespoons white glue
1 piece of wax paper
1 sample of coquina
1 magnifying glass
1 piece of paper and a pencil
Take a small amount of the pasta (maybe about a quarter of it) and break it into smaller pieces.
Put all of the pasta, whole and broken, into the cup.
Pour the water over the pasta and use the stirrer to stir it around until all of it is wet all over. Pour out the water out carefully.
Put the glue in the cup with the wet pasta and stir it until the pasta is evenly coated with it.
Dump the glue-coated pasta out onto the wax paper and leave it out to dry where it won’t be messed with.
Leave it to dry completely (this may take a day or so).
Pick up your homemade sample and look it over carefully. Draw a close-up picture of it showing the different shapes.
Coquina is a sedimentary rock that’s formed when seawater minerals cement seashells and sand together.