Day 24 How do sedimentary rocks form They

Day 24 How do sedimentary rocks form? They form when particles get compacted and cemented together. How do sediments tend to settle? They settle in horizontal layers, with new layers forming on top of old layers. Daily Warm-Up Exercises 1

Creating a Limestone Layer (Part 3) Investigation 5 Limestone 2

Limestone Ingredients What ingredient is common to all limestone? calcium carbonate (calcite) Where does the calcite come from? • shells of marine organisms • Powder (calcite powder) that forms when organisms exhale carbon dioxide into water that contains calcium. This powder is a precipitate. This is what we learned from our limewater experiment. 3

Making Limestone • Add a layer of limestone to your basin • Available ingredients: – – oyster shells clay sand plaster of paris 4

Plan Limestone Recipe • Turn to the Limestone Recipe on page 39. • Select and record your ingredients. • The total of all materials is 5 spoonfuls. – At least one spoonful of sand or clay – You MUST have plaster. It is our matrix. • The mixture should be thick, not runny – too much water will dissolve the sandstone layer!!!!! 5

Observe Limestone How can you be sure that what you made is limestone? do an acid test Which layer in your basin is oldest? sandstone Where is it located? bottom 6

Grand Canyon Layers Which of these layers is oldest? Tapeats Sandstone 7

Grand Canyon Layers Which layer is youngest? Kaibab Limestone 8

Superposition If you wanted to find the thing that had been in a garbage can the longest, where would you look? on the bottom Superposition is the idea that rock layers get older the closer they are to the bottom. 9

Original Horizontality How do sediments tend to settle? in horizontal layers, with new layers forming on top of old layers Original horizontality is the idea that layers are deposited in a horizontal or nearly horizontal position. Complete lab pages 39/41. 10

Reading • Read: Where in the World is Calcium Carbonate? Pgs. 68 -72 and answer questions page 72 in complete sentences! • Read Coconino Stories on pages 73 -75 and answer questions pg. 75 in complete sentences! • Complete sentences. That means the question is restated in the answer! Daily Warm-Up Exercises 11