aim: how do sedimentary rocks form? do now: using your esrt page 6, list the type(s) of rocks that...
DESCRIPTION
How do sedimentary rocks form? Land-Derived (Clastic) Sedimentary RocksTRANSCRIPT
Aim: How do sedimentary rocks form?
Do Now: Using your ESRT page 6, list the type(s) of rocks that can
become sedimentary rocks.
Describe what is found in the rock? How did it get there?
How do sedimentary rocks form?
Land-Derived (Clastic) Sedimentary
Rocks
How are land-derived sedimentary rocks formed?Land-derived Clastic
Sedimentary rocks form by:• Weathering- rocks break down into
smaller pieces called sediment. • Erosion- Sediments are transported
by wind, water, ice, or gravity.• Deposition: sediments are dropped
and buried• Compaction: overlying sediment
apply pressure and squeeze sediments together
• Cementation – natural “glue” of dissolved minerals in water that binds grains of sediment together
Lithification
How else can sedimentary rocks form?
How are sedimentary rocks formed chemically or organically?
• Chemical / Crystalline – minerals come out of solution by precipitation or evaporation, leaving crystals behind.
Ex. When saltwater evaporates rock salt
• Organically / Bioclastic- formed from organic matter such as plant or shell remains.
Ex. Coquina or limestone
How are the sedimentary rocks classified on page 7 of the ESRT?
MARINE/
Formation Process
Com
pact
ion
&
Cem
enta
tion
(Lith
ifica
tion)
Pre
cipi
tatio
n &
E
vapo
ratio
n
Lithification shell / plant fragments
According to the texture, Identify the two major groups of sedimentary rocks?
1. Clastic rocks – fragments of rocks compacted & cemented together
How do we differentiate between clastic and nonclastic rocks?
2. Non-clastic rocks – made from dissolved minerals or plant / shell remains (no sediments)
Clastic and Nonclastic rocks
*** Clastic rocks are classified by their grain size ***
Determine the characteristics that can be seen in these sedimentary rocks?
**ONLY Sedimentary Rocks contain Fossils**
Layers
Rain-drop impressions
Rock Fragments
Mud cracks
FOSSILS
Summary Activity ESRT page 71. Why are sedimentary rocks the only rock
types that contain fossils?2. How can sedimentary rocks form?
Extra Summary Questions