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Ck 12: Earth Science: Measuring Earthquake Magnitude
[Free Registration/Login may be required to access all resource tools.] Covers the instruments scientists use to measure earthquake magnitude.
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Ck 12: Physical Science: Hearing and the Ear
[Free Registration/Login may be required to access all resource tools.] Explains how we hear sound, how the ear works, and the different structures of the ear.
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Ck 12: Chemistry: Nature of Science
[Free Registration/Login may be required to access all resource tools.] Presents science as a group effort and covers how science information is communicated and shared.
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Ck 12: Physical Science: Musical Instruments
[Free Registration/Login may be required to access all resource tools.] How musical instruments make sounds, music and change pitch.
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Ck 12: Physical Science: Transition Metals
[Free Registration/Login may be required to access all resource tools.] Group 3-12 elements and their properties.
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Ck 12: Earth Science: Energy From Biomass
[Free Registration/Login may be required to access all resource tools.] How fuel can be produced from biological materials.
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Ck 12: Life Science: Barriers to Pathogens
[Free Registration/Login may be required to access all resource tools.] Your body has many ways to protect you from pathogens. Your body's defenses are like a castle. The outside of a castle was protected by a moat and high walls. Inside...
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Ck 12: Life Science: Cellular Respiration
[Free Registration/Login may be required to access all resource tools.] How does the food you eat provide energy? Through the process of cellular respiration, the energy in food is changed into energy that can be used by the body's...
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Ck 12: Life Science: Fungi Classification
[Free Registration/Login may be required to access all resource tools.] Scientists used to think that fungi were members of the plant kingdom. They thought this because fungi had several similarities to plants. However, there are a...
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Ck 12: Life Science: Importance of Arthropods
[Free Registration/Login may be required to access all resource tools.] Arthropods might seem a little scary, but they are actually performing important roles in the environment. Arthropods are important to the ecosystem and to humans in...
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Ck 12: Life Science: Indoor Air Pollution
[Free Registration/Login may be required to access all resource tools.] Recall that air pollution is due to chemical substances and particles released into the air mainly by human actions. When most people think of air pollution, they...
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Ck 12: Life Science: Influences on Darwin
[Free Registration/Login may be required to access all resource tools.] When Darwin returned to England at the end of his voyage, he did not rush to announce his discoveries. He did not want to present any ideas unless he had strong...
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Ck 12: Life Science: Types of Echinoderms
[Free Registration/Login may be required to access all resource tools.] Birds aren't the only creatures that have feathers. One type of echinoderm, the feather star, has feathery arms. These animals don't fly or even move much at all....
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Ck 12: Life Science: Vertebrate Characteristics
[Free Registration/Login may be required to access all resource tools.] Vertebrates are animals with backbones. These include fish, amphibians, reptiles, birds, and mammals. Learn more about vertebrate characteristics in this learning...
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Ck 12: Physical Science: Air Pressure and Altitude
[Free Registration/Login may be required to access all resource tools.] Atmospheric pressure and how it changes with increasing altitude, and how air pressure is used.
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Ck 12: Physical Science: Mechanical Advantage
[Free Registration/Login may be required to access all resource tools.] Actual and ideal mechanical advantage, how to calculate them and the mechanical advantage of different types of machines.
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Ck 12: Physical Science: Rate of Dissolving
The rate of dissolving and the factors that affect it. [Free Registration/Login may be required to access all resource tools.]
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Ck 12: Physical Science: Scope of Chemistry
[Free Registration/Login may be required to access all resource tools.] Definition of chemistry and examples of chemistry in everyday life.
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Ck 12: Physical Science: Solute and Solvent
[Free Registration/Login may be required to access all resource tools.] Definition of solute and solvent and examples. Water as a solvent and how ionic and covalent solutes dissolve in water.
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Ck 12: Physical Science: Synthesis Reactions
[Free Registration/Login may be required to access all resource tools.] Definition and example of a synthesis reaction.
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Ck 12: Physical Science: Wave Particle Theory
[Free Registration/Login may be required to access all resource tools.] The wave-particle theory and what a photon is, and evidence that electromagnetic radiation is both a particle and a wave.
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Ck 12: Life Science: Cardiovascular System Health
[Free Registration/Login may be required to access all resource tools.] There are many risk factors that can cause a person to develop cardiovascular disease. A risk factor is anything that is linked to an increased chance of developing...
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Ck 12: Life Science: Cardiovascular System
[Free Registration/Login may be required to access all resource tools.] Your cardiovascular system has many jobs. At times the cardiovascular system can work like a pump, a heating system, or even a postal carrier. To do these tasks,...
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Ck 12: Life Science: Importance of Insects
[Free Registration/Login may be required to access all resource tools.] Many insects are considered to be pests by humans. However, insects are also very important for numerous reasons. Learn more about the importance of insects in this...
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