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January 17, 2013Q-2 Pg. Science Starter : Explain why iron can be found in rocks. How are mechanical and chemical weathering similar to physical and chemical changes? How are they different? Why does metamorphic rock often have bands of different colors in the rock?. - PowerPoint PPT Presentation
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January 17, 2013 Q-2 Pg.Daily Goal: We will be able to classify 3 different types of rocks. Homework: Turn in missing work! Finish weathering packet
Science Starter: 1. Explain why iron can be found in rocks.
2. How are mechanical and chemical weathering similar to physical and chemical changes? How are they different?
3. Why does metamorphic rock often have bands of different colors in the rock?
Classification of Rocks
Sedimentary
Sedimentary Rock: rock formed fromlayering of sediment (broken pieces ofrock)
SANDSTONE
Sedimentary
Sedimentary rock is made of large pieces of sediment such as pebbles and stone.
CONGLOMERATE
SEDIMENTARY
• Clastic (chunks of other rocks)• Bioclastic (shells, organic remains)• Crystalline (crystals of salt)• Similar-colored layers
Clastic - Rocks composed of fragments of pre-existing rocks; fragmental
Bioclastic - Rocks derived from shell fragments or other organic remains
Crystalline - Rocks composed of crystals
Metamorphic
Metamorphic Rock: rock formed from heat and pressure
In some metamorphic rocks, you can see where the mineral grains are flattened from the heat and pressure!
GNEISS
Metamorphic• Metamorphic rocks
are rocks that have morphed into another kind of rock.
SCHIST
METAMORPHIC
• Foliation (layers)• Microscopic mica crystals• Stretched/distorted pebbles or fossils
Igneous
• Igneous Rock: rock formed from the cooling of magma.• The cooling
magma gets caught in pockets and cools to form igneous rock
IgneousYou can see here pockets of air formed during cooling.
SCORIA
OBSIDIAN
Obsidian rocks are formed when lava cools quickly above ground
IGNEOUS• Vesicular• Coarse-grained• Glassy
Vesicular - Rock that has gas pockets
Coarse - Rock that has a chunky, large particles
Glassy - Rock that has a smooth, glass-like texture
Discussion Question 1. Why is it unlikely that fossils would be found
in igneous rocks?
Discussion Question 2. If a metamorphic rock
contained fossils, how might they look?
Discussion Question 3. Why might igneous rocks be porous (or have
little holes)?
Discussion Question 4. What is the difference between erosion and
weathering?
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