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Materials and their properties - Matter and materials
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What are materials? Materials are the different types of matter that objects are made from. Some materials, like wood, cotton and wool, are found in nature. They are called natural materials. We use…
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Work it out. Matter and its properties
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Copy the false statements from this list into your notebook and give the reasons why they are false: The different types of matter are called physical systems. Chemical compounds are pure substances…
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True/false. The simplest invertebrates
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Are the following sentences true or false? Sponges are plants that live on rocks in the sea. Sponges have cells with flagella, called choanocytes, to move around. Most flatworms are parasites.…
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True/false. Bioelements and biomolecules
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Are the following sentences true or false? Living things and rocks are made up of different chemical elements. All bioelements are present in living beings. Oligoelements are not bioelements.…
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Complete. Extracting minerals
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Complete the text with the missing words: concentrated – scarce – passages – geológico – deposits – opencast – mines – underground Some minerals of economic interest are . Sometimes they…
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True / false. The deserts
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Which of the following statements are true or false: The wadis are watercourses with a regular flow. Inland deserts are influenced by the ocean. The hottest deserts are located in Ecuador. There are…
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Self-assessment T9 02 - The skeletal-muscular system
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Are these sentences true or false? Our skeleton is made up of bones and tendons. The cranium consists of one bone. The bones of movable joints are joined together by strong cords called ligaments.…
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Learn... Extracting minerals
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Some minerals of economic interest are scarce. Sometimes they appear in concentrated amounts in the Earth's crust. These are called mineral deposits. The places where humans extract mineral deposits…
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Bacteria and humans
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4.1. Industrial use of bacteria Many bacteria are beneficial because they are used in industrial processes. In the food industry, bacteria are used to make yoghurts and to turn wine into vinegar. They…
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True / False. The kidneys
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Are these sentences true or false? The kidneys are located above our waist. They are shaped like beans and are about the size of a fist. The kidneys extract carbon dioxide from urine. The urinary tubes…
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