CK-12 Foundation
Ck 12: Arithmetic: Fractions as Percents Grade 8
[Free Registration/Login may be required to access all resource tools.] Write percents as fractions and fractions as percents
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Ck 12: Physical Science: Energy Conversion
[Free Registration/Login may be required to access all resource tools.] Decribes how energy changes from one form to another and energy changes between kinetic and potential energy.
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Ck 12: Physical Science: Longitudinal Wave
[Free Registration/Login may be required to access all resource tools.] What a longitudinal wave is, its compressions and rarefactions and what a P wave is.
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Ck 12: Physical Science: Physical Change
[Free Registration/Login may be required to access all resource tools.] Definition of physical change and examples, and how physical changes can be reversed.
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Ck 12: Physical Science: Projectile Motion
[Free Registration/Login may be required to access all resource tools.] Projectile motion and combining forces, examples of projectile motion.
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Ck 12: Physical Science: Thermal Radiation
[Free Registration/Login may be required to access all resource tools.] How thermal energy is transferred by thermal radiation and sources of thermal radiation.
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Ck 12: Physical Science: Types of Friction
[Free Registration/Login may be required to access all resource tools.] The four types of friction and how they act on objects.
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Ck 12: Physical Science: Wave Interference
[Free Registration/Login may be required to access all resource tools.] What wave interference is, constructive and destructive interference and how standing waves occur.
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Ck 12: Earth Science: Solar Power
[Free Registration/Login may be required to access all resource tools.] How solar energy can be collected and used, and the consequences of it.
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Ck 12: Life Science: Bacteria Nutrition
[Free Registration/Login may be required to access all resource tools.] Like all organisms, bacteria need energy, and they can acquire this energy through a number of different ways. Learn more about bacteria nutrition in this learning...
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Ck 12: Life Science: Food and Nutrients
[Free Registration/Login may be required to access all resource tools.] Refusing one meal won't stunt your growth. But lack of proper food over a period of time can lead to malnutrition. That means the body is not getting enough...
CK-12 Foundation
Ck 12: Life Science: Fungi Reproduction
[Free Registration/Login may be required to access all resource tools.] Different fungi reproduce in different ways. Many fungi reproduce both sexually and asexually. However, some reproduce only sexually and some only asexually. Asexual...
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Ck 12: Life Science: Importance of Reptiles
[Free Registration/Login may be required to access all resource tools.] Reptiles play an important role in the life of humans. In addition to playing an important role in many food chains, which keep the populations of small animals...
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Ck 12: Life Science: Lizards and Snakes
[Free Registration/Login may be required to access all resource tools.] Lizards and snakes belong to the largest order of reptiles, Squamata. Lizards are a large group of reptiles, with nearly 5,000 species, living on every continent...
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Ck 12: Life Science: Molecular Evidence for Evolution
[Free Registration/Login may be required to access all resource tools.] Chimpanzees and humans turn out to be very similar - if you look at their DNA. When scientists determined the entire genetic code of both humans and chimpanzees,...
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Ck 12: Life Science: Respiration
[Free Registration/Login may be required to access all resource tools.] We breathe because we need oxygen. Breathing also releases carbon dioxide from our bodies into the air. The respiratory system is the body system that brings air...
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Ck 12: Physical Science: Vision and the Eye
[Free Registration/Login may be required to access all resource tools.] The structure and function of the eye and how we see.
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Ck 12: Earth Science: Heat Transfer in the Atmosphere
[Free Registration/Login may be required to access all resource tools.] How heat is transferred in the atmosphere.
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Ck 12: Earth Science: Milky Way
[Free Registration/Login may be required to access all resource tools.] Identify the shape and size of the Milky Way and where our solar system is located in the Milky Way.
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Ck 12: Earth Science: Seismic Waves From Earthquakes
[Free Registration/Login may be required to access all resource tools.] The signs scientists might see prior to an earthquake occurring.
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Ck 12: Life Science: Habitat Destruction
[Free Registration/Login may be required to access all resource tools.] From a human point of view, a habitat is where you live, go to school, and go to have fun. Your habitat can be altered, and you can easily adapt. Most people live in...
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Ck 12: Life Science: Harmful Bacteria
[Free Registration/Login may be required to access all resource tools.] With so many species of bacteria, some are bound to be harmful. Harmful bacteria can make you sick. They can also ruin food and be used to hurt people. Learn more...
CK-12 Foundation
Ck 12: Life Science: Hearing and Balance
[Free Registration/Login may be required to access all resource tools.] What do listening to music and riding a bike have in common? It might surprise you to learn that both activities depend on your ears. The ears do more than just...
CK-12 Foundation
Ck 12: Life Science: Helpful Bacteria
[Free Registration/Login may be required to access all resource tools.] Can we survive without bacteria? Could bacteria survive without us? Learn more about helpful bacteria in this learning module produced by CK-12.
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