4th Grade-Ch 8 Lesson 2 How Are Sedimentary Rocks Formed
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Transcript of 4th Grade-Ch 8 Lesson 2 How Are Sedimentary Rocks Formed
Ch. 8Lesson 2How are
sedimentary rocks formed?
Activity-Sedimentary Sandwich
Layer of sandwich
Layer of geologic time scale- description
Bottom slice of bread (sand)
Precambrian Era- jellyfish fossils
Peanut butter (mud)
Paleozoic Era- fish, insect fossils
Jelly (old decaying plants)
Mesozoic Era- dinosaur fossils
2nd slice of bread
Cenozoic Era- flowering plants fossils
Precambrian Era
Paleozoic Era
Mesozoic Era
Cenozoic Era
Sedimentary Sandwich
sedimentaryrock
form when layers of
materials & rock particles settle on top of each other
& harden
plant & animalfossils
examples:
conglomerate
sandstone
A fossil of a dragonfly, from Germany, about 150 million years ago.
sandstone
limestone
mudstone
sediment•eroded material that settles on land or on bottoms of lakes, rivers & oceans
Weathering and erosion have created this rippling red sandstone landscape. Sedimentary rocks such as sandstone
weather easily compared to some other types of rock.
After an animal dies, its skin, muscles and other soft body parts decay. Its skeleton,
shell, or other body parts are left.
Sediments such as sand or mud settle on top of the remains.
More layers form. Eventually, materials in the remains may be
replaced with minerals in the sediment that harden into rock.
Over many years, the rock layers weather and erode. The fossil
appears at the surface.