Starter – in the back of your book. • Can you label the parts of the rock cycle?
Objectives • Learn and use new scientific vocabulary; • Revise the rock cycle; • Revise the three types of rocks, examples and their properties; • Understand how sedimentary rocks show evidence of how they were deposited.
What is a rock? • A solid naturally occurring, non-living material. • Most are ,made of tiny particles stuck together. • Geologists study rocks. • Rocks include: clay, sand, as well as rocks you may already know like sandstone.
Igneous Rocks • Made from cooled magma; • Have crystals; • The slower it cools, the bigger the crystals; • Hard; • Impermeable.
Sedimentary rock • Layers; • Fossils; • Porous; • Grains. Show evidence of how they were deposited and that the Earth’s crust is unstable.
Metamorphic rock • Rocks changed by heat or pressure; • May have crystals; • Impermeable; • May have fossils.
Looking at rocks • You have sample of rocks in front of you. • Look at the surface through a hand lens; • Scratch the surface with the mounted needle to see how hard it is; • Is the rock porous, use water and a pipette; • Is the rock effected by chemical weathering (drop acid onto its surface). Note your observations in an appropriate table and determine which category they fit into.
Homework • Complete GCSE questions on the sheet for Friday.
Starter – true or false? • Sedimentary rocks will have crystals; • Metamorphic rocks may have fossils in them; • The youngest sedimentary rocks are underneath older rocks; • The Earth’s crust is stable; • Mountain ranges are caused by the Earth’s crust moves; • Calcium carbonate, marble, limestone and chalk are all the same chemical.
Objectives • To know the chemical composition and properties of limestone; • To understand hoe it is quarried and used in industry.
Limestone • What is its formula? • What type of bonding is present? • What type of rock is it? • What are the two uses of limestone illustrated by these photographs?