Sedimentary Rocks
•Sedimentary rocks are made of sediments that have settled into layers.
•Sediments are moved by water and wind.
–They pile up in layers.
–Sometimes these layers are on land, but often they are at the bottom of an ocean, river, or lake.
–Over time , the layers of sediment become rock.
•Sediments are moved by water and wind.
–They pile up in layers.
–Sometimes these layers are on land, but often they are at the bottom of an ocean, river, or lake.
–Over time , the layers of sediment become rock.
A nickname for sedimentary rocks is 'sandwich rocks.'
This is because many layers of small pieces of earth collect on top of each other in layers. These layers are pressed down more and more until the bottom layers slowly turn into hard rock.
This is because many layers of small pieces of earth collect on top of each other in layers. These layers are pressed down more and more until the bottom layers slowly turn into hard rock.
There are different kinds of sedimentary rock. These different kinds are determined by what type of sediments made up the rock:
•Some are made up of different size sediments.
–Sandstone, shale, and siltstone are this kind of rock.
•Some sedimentary rocks are made from minerals left behind when water evaporates.
–Halite and gypsum are this kind of sedimentary rock.
•Others are made of once-living things.
–Coal, chalk, and most limestone are this kind of rock.
•Some are made up of different size sediments.
–Sandstone, shale, and siltstone are this kind of rock.
•Some sedimentary rocks are made from minerals left behind when water evaporates.
–Halite and gypsum are this kind of sedimentary rock.
•Others are made of once-living things.
–Coal, chalk, and most limestone are this kind of rock.
Limestone Sandstone Coal