Basins • Observations and profile-view drawing • What two rocks are in our basin? • In nature, what materials are sandstone made of? • In nature, what materials are shale made of? • What kind of environments could you infer these rocks would form in? What are characteristics of these environments?
What is the next layer we need to add in our basin? • LIMESTONE!!!
Limestone • In your groups, discuss limestone and the environment limestone would be formed in. Use the sample given to you and your notes and observations you’ve made so far. • Write down your ideas in your notebook.
Limestone • What was an interesting observation we made about limestone, a characteristic that none of the other rocks had? • What happened when you put hydrochloric acid on the rock? • What caused the fizz? • Can anyone remember the name of the material that reacted with the acid?
Limestone Environment • Limestone is created in a seawater environment. • What in this environment could create calcium carbonate? • In your groups, make a list of things you know are in seas that could contribute to making calcium carbonate.
Testing Your Ideas • We don’t have any of the ancient animals that lived in the sea millions of years ago. • But, we do have the sea water. • I have prepared some water similar to ancient seawater. • We have the seawater, but we need to simulate animals living in it.
How could we simulate animal life in our seawater samples? • What we will be doing is introducing carbon dioxide into the environment. • How could we do that? • We exhale carbon dioxide, therefore, we will be exhaling and blowing bubbles into our seawater.
The Special Ingredient in Our Seawater! • This water is not plain water, it has a chemical called calcium hydroxide. • This chemical dissolved in water is called lime water. Ancient seawater contained this chemical.
Lime Water Procedure • Open lab books Page 37. • Read through the procedure. • Follow the procedure carefully. • REMEMBER TO MAKE OBSERVATIONS!!!!!
Control • What is a control? • Controls are used in science to have something to compare our results against. • Our control will not have carbon dioxide introduced into it, therefore, you can compare what effects the carbon dioxide had on your seawater.