Earth’s Interior and Plate Tectonics Earth’s Interior Weathering Physical and Plate and Erosion Evidence Weatheri Tectonics for Plate ngWhat isEarth’s Tectonics ChemicalInterior Weatheri like Transform ng Erosion Fault Boundaries Earthquake Plate Convergent Minerals Tectonics s and Plate and Rocks Boundaries Volcanoes Divergent How old Plate What are Structure are Rocks Boundaries Earthquake Volcanoes and s Origin of Rocks
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 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.