Practice for Science 2 Students
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This document contains definitions for science terms related to biology. It defines key cellular structures and processes like the nucleus, cell membrane, organelles, and cellular respiration. It also defines genetics terms such as dominant and recessive traits, genes, genetics, and inherited characteristics. Reproductive terms like egg cell and mitosis are defined. Finally, it defines broader biological concepts such as organism, tissue, and photosynthesis.
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The document discusses the six simple machines: lever, wheel and axle, inclined plane, pulley, wedge, and screw. It provides examples and diagrams of each machine, then has an interactive exercise for the reader to test their understanding by identifying examples of the simple machines. The conclusion reminds that while simple machines make work easier, more complex machines like robots are not considered simple machines. It thanks the reader for learning.
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The document discusses the composition and properties of air. It states that air is a mixture composed primarily of nitrogen (78%), oxygen (21%), and trace amounts of other gases like carbon dioxide and inert gases. It also notes that air contains varying amounts of water vapor, microorganisms, and dust. The document then examines the properties of oxygen and carbon dioxide through various tests, finding that oxygen supports combustion and is neutral, while carbon dioxide is acidic and does not support combustion.
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Air pressure is caused by air particles constantly moving and colliding with surfaces. It presses down on everything from above and its strength decreases with increasing altitude as there is less air. Many tools like syringes and sprayers use air pressure principles in their functions. Safety measures must be followed when working with pressurized gases.
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This document discusses the different types of simple machines: levers, pulleys, inclined planes, screws, wedges, and wheels and axles. It describes the key components and functions of each machine. First class, second class, and third class levers are explained as well as how their configurations determine mechanical advantage. Pulleys can be fixed, movable, or used in combination. Inclined planes reduce the force needed to overcome gravity. Screws use threads to convert rotational motion to linear motion. Wedges increase force by changing the direction of an input force. Wheels and axles function as a rotating lever with the axle as the fulcrum.
Chapter 10 simple machine
This document discusses simple machines. It defines a machine as a device that helps overcome a load with less effort. The six simple machines are identified as the lever, pulley, wedge, screw, inclined plane, and wheel and axle. The lever is then discussed in more detail. It works by turning about a fixed point called a fulcrum, allowing a small effort force to overcome a larger load force. The positions of the load, effort, and fulcrum determine the mechanical advantage of the lever. Simple machines like levers, rollers, and wedges were used to build ancient structures. Modern machines are more complex but still rely on simple machines.
Chapter 5 water and solution
Here are the key ways to control water pollution mentioned on page 41:
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- Control surface runoff from agricultural land by terracing, contour ploughing and establishing buffer zones along water bodies. This prevents soil erosion and entry of agricultural chemicals into water.
- Proper disposal of solid waste and control of open defecation to prevent entry of pathogens into water sources.
- Control discharge of oil and chemical spills from ships and tankers.
- Maintain minimum flow in rivers to ensure sufficient self-purifying capacity. Abstraction of water should be regulated.
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My Presentation On Simple Machines
This PowerPoint presentation introduces 3rd grade students to simple machines. It defines six simple machines - the inclined plane, lever, pulley, screw, wedge, and wheel and axle. For each machine it provides an example, definition, and photos of the machine found on a playground. The presentation concludes that simple machines make work easier, have few moving parts, and can be combined to form more complex machines. It aims to teach students to identify the six simple machines and their functions.
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This document discusses interdependence among living organisms and the environment. It covers topics such as species, populations, communities, habitats, ecosystems, interactions between living organisms including predator-prey relationships, symbiosis, competition, food webs, and the importance of photosynthesis. Photosynthesis produces oxygen and food for animals while using carbon dioxide, and the carbon and oxygen cycles help regulate gas levels on Earth. Conservation efforts aim to preserve natural resources for future generations.
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