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1. All of these are examples of ways in which models can help scientists except A. Communicating observations and ideas Saving time, money, equipment, and lives Predicting exactly what will happen Predicting possible outcomes B. C. D. Technicians plan to develop a new type of keyboard that will have alphabet letters in different positions from a standard keyboard. Which will BEST help the technicians decide if the new keyboard is an improvement over the standard one? 2. Asking people their opinions of how they like standard keyboards B. Analyzing the problems that people have using standard keyboards C. Determining how much it will cost to make a new keyboard D. Comparing the speeds at which people type on each style of keyboard A. Bell work 9/14/2015-GET YOUR COMP BOOK! Technology developed for the space program has resulted in both intended and unintended benefits. Which of these is the MOST likely intended benefit of Hubble Space Telescope technology? Lenses that filter dangerous light that comes from the sun B. Video headsets that magnify people’s view of their surroundings C. Cordless, rechargeable remote-control devices D. Colorful, expensive materials used to print off pictures A. What is a mineral? Plates=silica and feldspar Radio=aluminum, copper, gold, iron Toaster=copper, iron, nickel, mica, chromium What is a mineral? To be a mineral, it must have all five of the criteria below. 1. 2. 3. 4. 5. They are not made by humans. They have never been alive and are not made up from plants or animals. They are solids. Each one is made of a particular mix of chemical elements. Minerals “grow” as crystals because the elements that make them up are arranged in a certain way. What do you think… Object #1: Wood No What do you think… Object #2: Quartz Yes What do you think… Object #3: Plastic No What do you think… Object #4: Graphite Yes What do you think… Object #5: Copper Yes What makes up a mineral? Mineral Facts: There are thousands of different kinds of minerals. Many of the minerals come from magma cooling. Some are formed from compounds dissolved in a liquid. There are about 100 common minerals formed from the 8 most abundant elements from the Earth’s crust: aluminum, iron, calcium, sodium, potassium, magnesium, oxygen, and silicon. Two Groups of Minerals: Silicate Minerals silicon and Made up of ________ oxygen __________ 90 Make up ______% of Earth’s crust Mica and Ex: Quartz, ________, Feldspar Nonsilicate Minerals Does not contain silicon or oxygen __________ Made up of Carbon, Oxygen, Fluorine, and Sulfur _____________ Ex: Native elements, Carbonates Halides, ____________, Oxides, Sulfates, and Sulfides Examples of Minerals: Silicate Minerals Examples of Minerals: Nonsilicate Minerals Properties of Minerals How to identify minerals… Color Luster – the way a mineral reflects light (metallic or non-metallic) Hardness – the ability of a mineral to resist being scratched Streak – powder scraped off is the same color as the mineral Density Crystal shape – 6 basic crystal shapes Cleavage and fracture – how a mineral breaks Special properties – individual properties that individual minerals have (ex. Magnetite is naturally magnetic) Today’s Goals: Know how to tell if something is a mineral or not Explain how color and luster are used to identify minerals LUSTER Luster refers to how light is reflected from the surface of a mineral. Is it shiny? Does it look oily? COLOR Most minerals occur in more than one color. Luster: Yes or No? Yes Luster: Yes or No? Yes Luster: Yes or No? No Luster: Yes or No? Yes (glassy Luster: Yes or No? Yes Luster: Yes or No? No Why is color not the best property to use to identify a mineral?