TYPES OF ROCKS
What are rocks?
Rocks and Stones are naturally occuring solids made up of minerals. The Earths crust is made up of rocks. Rocks are really important for humans because they have been used by humans for millions of years, from early tools and weapons through to various construction materials. There are many types if rocks based on the way they are formed but we will be studying the three main types:
Igneous - Sedimentry - Metamorphic.
What is a rock - cycle?
Did you know that rocks are recycled? So some rocks which are about 4 millions years old are being changed into different types of rocks. It takes about millions of years for it to change.
THE PROCESS:
When volcanoes erupt and lava falls out, igneous rocks form. Some of these igneous rocks roll down the mountains formed by the volcano and eventually end up in the ocean. As they roll, bits of pieces of the igneous rocks are broken and form sediments. Layer after layer of sediments are pressed and and cemented together forming sedimentary rocks. Some of the sedimentary rocks on the very bottom get hot because of the pressure and change to metamorphic rocks. When the metamorphic rocks get buried deeper, it gets hotter and melts. Once again, its magma and may eventually be pushed up and out of the volcano.
The rock cycle begins all again!!
What are rocks?
Rocks and Stones are naturally occuring solids made up of minerals. The Earths crust is made up of rocks. Rocks are really important for humans because they have been used by humans for millions of years, from early tools and weapons through to various construction materials. There are many types if rocks based on the way they are formed but we will be studying the three main types:
Igneous - Sedimentry - Metamorphic.
What is a rock - cycle?
Did you know that rocks are recycled? So some rocks which are about 4 millions years old are being changed into different types of rocks. It takes about millions of years for it to change.
THE PROCESS:
When volcanoes erupt and lava falls out, igneous rocks form. Some of these igneous rocks roll down the mountains formed by the volcano and eventually end up in the ocean. As they roll, bits of pieces of the igneous rocks are broken and form sediments. Layer after layer of sediments are pressed and and cemented together forming sedimentary rocks. Some of the sedimentary rocks on the very bottom get hot because of the pressure and change to metamorphic rocks. When the metamorphic rocks get buried deeper, it gets hotter and melts. Once again, its magma and may eventually be pushed up and out of the volcano.
The rock cycle begins all again!!