Presentation on theme: "1A2 Geography 9 th March 2015 Objective: to introduce students to the formation and uses of sedimentary rock."— Presentation transcript:
1A2 Geography 9 th March 2015 Objective: to introduce students to the formation and uses of sedimentary rock
Homework: O Textbook, page 92, Q. 2 (i) & (ii), and Q. 3 (i) & (ii). O Name the category of rock that limestone belongs to, and name a location where limestone is found. O Name two rocks, describe one use for each.
KWL know What we know want What we want to know learned What we have learned All rocks differ according to: 1. Mineral content. 2. 3. 4. ________________ There are three groups of rock: 1. 2. 3. Metamorphic. What is sedimentary rock? How is it formed? Examples of sedimentary rock?
Sedimentary Rock sediments O Rock that formed from sediments (remains) of dead plants and animals, and other rock. O Deposited O Deposited (dropped) on sea and lake beds, as well as on land. O Layers O Layers built up over time. compressed O These layers were compressed (squeezed) and cemented creating solid rock.
Sedimentary Rock: Sandstone O Sand was worn away from the crust. O Carried by wind and water. O Deposited on beds of seas and lakes, and on land. O Layers built-up and were compressed together to form sandstone. O (Show rock and sand samples).
Sedimentary Rock: Sandstone O Colour: Red, purple, brown, grey, and white. O Texture: Course grained – it is a rough rock! O Uses: Construction industry. Used to make patios and floor tiles. O Location: Galtee Mountains (Cork), and MacGillicuddy’s Reeks (Kerry).
Sedimentary Rock: Limestone O Remains of dead plants and animals (including fossils & shells) deposited on the bottom of warm, shallow sea. O Layers built up over millions of years. O Weight compressed these sediments into layers of solid rock. permeable soluble O Easily worn away by water! Flowing water can erode through it (permeable). It is also easily dissolved (soluble) – see example.
Sedimentary Rock: Limestone O Colour: Grey. O Texture: Very soft. Easily worn away by water. O Uses: Construction industry (lime used to make cement). Agriculture (ground lime is very good for the soil – increases fertility). O Location: The Burren, Co. Clare.
Sedimentary Rock: Coal O Is coal an example of a sedimentary rock? O Why isn’t this rock used in the construction industry? O It’s a valuable fossil fuel!
KWL know What we know want What we want to know learned What we have learned All rocks differ according to: 1. Mineral content. 2. Texture. 3. Hardness. 4. Colour. ________________ There are three groups of rock: 1. Igneous. 2. Sedimentary. 3. Metamorphic. What is sedimentary rock? How is it formed? Examples of sedimentary rock? Formed from sediments. Layers build-up, are compressed and form solid rock. Limestone: grey, used in construction/ farming. Easily dissolved. Found in the Burren. Sandstone: Variety of colours, used in construction, found in mountains in the South. Coal is a sedimentary rock.