Do Now/Review December 4-8, 2023

“All matter has both physical and chemical properties and chemical properties.Physical properties are those that can be observed without changing the make-up, or identity of the matter. For example, clay is malleable, which means it will bend or flatten when squeezed. Squeezing changes the shape of the clay but does not change what the clay is made of. Malleability is an example of a physical property.Chemical properties describe matter based on its ability to change into a new kind of matter with different properties. For example, paper is flammable: it is capable of burning in the presence of oxygen. Flammability is a chemical property of paper. A chemical property of iron is its tendency to rust. Rusting occurs when iron reacts with oxygen to produce iron oxide. Reactivity to acid and to water are two more examples of chemical properties.”

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In the passage, how is the information organized?

In many parts of the world, people do not have enough water to drink. It is the biggest problem of the next 100 years. Earth is not running out of water. There is plenty of it. But most of it is in the oceans. Ocean water is too salty to drink. What if there was a way to make ocean water drinkable? There is. It is called desalination. Desalination is a way of taking the salt out of ocean water. Water that goes through a desalination plant can be used on farms and in homes. For some large cities, desalination offers a quick way out of a bad situation.

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What Happened to the Dinosaurs?

There are many theories about why the dinosaurs vanished from the planet. One theory that many people believe is that a gigantic meteorite smashed into the Earth. Scientists believe that the meteorite was very big and that the impact may have produced a large dust cloud that covered the Earth for many years. The dust cloud may have caused plants to not receive sunlight and the large plant eaters, or herbivores, may have died off, followed by the large meat eaters, or carnivores. This theory may or may not be true, but it is one explanation as to why these giant reptiles no longer inhabit the Earth.

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“Earthquakes happen all over the world in areas called seismic zones. Seismic zones occur where the plates of crust covering the Earth’s surface meet each other. Inside the Earth, the mantle is always moving, which in turn moves the plates. These plates push against each other, building up tension between them. When the tension between plates becomes too great, they grind against each other, causing the Earth’s surface to tremble and shake.”

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“Imagine you have a solid substance, such as ice. Heat it, which makes its temperature rise. When it reaches a certain level, the temperature stops rising and the substance begins to turn into a liquid. This temperature is called the substance’smelting point. You keep heating. When all the solid has turned to liquid, the temperature begins to rise again. Eventually the temperature stops rising and the liquid begins to turn into a gas. The temperature at which this happens is called the boiling point. If you keep heating the temperature stays the same until all the liquid is gone. Then the temperature begins to rise again.”

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