2.3b kinds of rocks and weathering
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Transcript of 2.3b kinds of rocks and weathering
Earth’s Interior and Plate Tectonics
Earthquakes and Volcanoe
s
Earth’s Interior
and Plate
Tectonics
Minerals and Rocks
What is
Earth’s Interior like
Evidence for Plate
Tectonics
What are Earthqua
kes
Structure and
Origin of
Rocks
How old are RocksVolcano
es
Weathering and Erosion
Erosion
Chemical
Weathering
Physical
Weathering
Transform Fault Boundar
iesConverg
ent Plate
BoundariesDiverge
nt Plate Boundar
ies
Plate Tectonic
s
Vocabulary
Minerals – a natural, inorganic solid with a definite chemical composition and a characteristic internal structure.
Vocabulary
Igneous Rock - from cooled and hardened magma or lava.
Vocabulary
Weathering – change in the physical form or chemical composition of rock materials exposed at Earth’s surface.
Vocabulary
Sedimentary Rock – rock formed from compressed or cemented deposits of sediments.
Vocabulary Fossils – the traces of remains of a plant or
an animal found in sedimentary rocks.
Vocabulary Metamorphic rock – rock formed from other rocks
as a result of heat, pressure, or chemical processes.
Igneous Rock
The faster the rock cools the less the crystals grow.
Igneous Rock
Obsidian rocks are smooth stones used by early American Indians to make tools.
Their composition is much like that of granite.
Igneous Rock
Obsidian becomes smoother as they cool much more quickly.
Because they cool more quickly, they have less or no crystals.
2 kinds of Igneous Rock
2 kinds of Igneous Rock
Extrusive igneous rock cools on Earth’s surface.
2 kinds of Igneous Rock
Intrusive igneous rock forms from magma that cools while trapped beneath Earth’s surface.
They are insulated and cools off slowly
2 kinds of Igneous Rock
Because of long cooling period, the crystals form.
Crystals on intrusive igneous are larger than those on extrusive igneous.
Weathering
Weathering is the process by which rocks are broken down as follows: Pieces of boulders fall down hillsides
due to gravity, wind or rain. Rivers carry rocks down into deltas,
lakes or the sea. Waves beating against cliffs.
Weathering
Gravity, waves, rivers, wind, etc. break the pieces into pebbles, sand and even smaller pieces.
As pieces of rock accumulate, they can form another type of rock: Sedimentary rock.