CK-12 Foundation
Ck 12: Life Science: Mammal Reproduction
[Free Registration/Login may be required to access all resource tools.] Mammals don't typically lay eggs, but monotremes are the exception. All other mammals give birth to live young and belong to one of two categories, the marsupials...
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Ck 12: Life Science: Preventing Infectious Diseases
[Free Registration/Login may be required to access all resource tools.] Infectious diseases are diseases that spread from person to person. What can you do to avoid infectious diseases? Eating right and getting plenty of sleep are a good...
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Ck 12: Life Science: Scientific Theories
[Free Registration/Login may be required to access all resource tools.] Today most people realize that microorganisms, such as bacteria or viruses, are the cause of disease. This concept is known as the germ theory of disease, one of the...
CK-12 Foundation
Ck 12: Physical Science: Activation Energy
[Free Registration/Login may be required to access all resource tools.] Definition of activation energy and why all chemical reactions require it.
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Ck 12: Physical Science: Chemical Formula
[Free Registration/Login may be required to access all resource tools.] How to write chemical formulae and what they represent about the substance.
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Ck 12: Physical Science: Ethics in Science
[Free Registration/Login may be required to access all resource tools.] Definition of ethics, ethical rules in science, and how science influences ethical decisions.
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Ck 12: Algebra: Scientific Notation
[Free Registration/Login may be required to access all resource tools.] Scientific notation, why it is used, and converting numbers to and from scientific notation.
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Ck 12: Physical Science: Compound Machine
[Free Registration/Login may be required to access all resource tools.] Provides a definition of a compound machine with examples and discusses the efficiency and mechanical advantage of compound machines.
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Ck 12: Physical Science: Electrical Grid
[Free Registration/Login may be required to access all resource tools.] Explains what an electrical grid is and the role of power plants, transmission lines, and electric substations.
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Ck 12: Physical Science: Electric Safety
[Free Registration/Login may be required to access all resource tools.] Overview of electric safety: short circuits, electric safety features, and how to use electricity safely.
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Ck 12: Physical Science: Inclined Plane
[Free Registration/Login may be required to access all resource tools.] Discusses what an inclined plane is, its mechanical advantage, and how it changes force to make work easier.
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Ck 12: Physical Science: Momentum
[Free Registration/Login may be required to access all resource tools.] Definition of momentum and how it relates to mass and velocity, and calculating momentum.
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Ck 12: Physical Science: Technological Design Constraints
[Free Registration/Login may be required to access all resource tools.] The technological design process is a step-by-step approach to finding a solution to a problem. Often, the main challenge in technological design is finding a...
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Ck 12: Earth Science: Conserving Water
[Free Registration/Login may be required to access all resource tools.] Describes how we can conserve water.
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Ck 12: Earth Science: Solar Energy on Earth
[Free Registration/Login may be required to access all resource tools.] Describes characteristics of solar energy including the electromagnetic spectrum and movement.
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Ck 12: Physical Science: Scientific Induction
[Free Registration/Login may be required to access all resource tools.] Inductive reasoning in science and its limitations.
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Ck 12: Thermal Conductors and Insulators
[Free Registration/Login may be required to access all resource tools.] Descriptions and examples of thermal conductors and insulators are discussed and shown.
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Ck 12: Earth Science: Availability of Natural Resources
[Free Registration/Login may be required to access all resource tools.] How various factors affect the cost of resources.
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Ck 12: Earth Science: Deposition by Groundwater
[Free Registration/Login may be required to access all resource tools.] How groundwater creates landforms.
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Ck 12: Earth Science: Erosion by Groundwater
[Free Registration/Login may be required to access all resource tools.] Describes erosion of rock caused by groundwater.
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Ck 12: Earth Science: Metamorphic Rock Classification
[Free Registration/Login may be required to access all resource tools.] Examines how to classify metamorphic rocks.
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Ck 12: Life Science: Control of Insects
[Free Registration/Login may be required to access all resource tools.] Ladybugs won't hurt you. But they are dangerous to some other insects! Ladybugs eat plant-harming bugs known as aphids. Since they have an appetite for aphids,...
CK-12 Foundation
Ck 12: Life Science: Habitat and Niche
[Free Registration/Login may be required to access all resource tools.] Are you on the basketball team? Are you a cheerleader? Do you play an instrument in the band? Your niche would be your role or place in the school. Organisms also...
CK-12 Foundation
Ck 12: Life Science: Importance of Echinoderms
[Free Registration/Login may be required to access all resource tools.] Echinoderms are important for the ecosystem. They are also a source of food and medicine for humans. Learn more about the importance of echinoderms in this learning...
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