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The Earth's satellite: the Moon
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3.1. General characteristics of the moon The Moon is the only natural satellite of the Earth. It is 49 times smaller than our planet. As the Moon does not have an atmosphere, the Sun's rays and the…
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The depletion of the ozone layer
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In the 80s, a decrease in the thickness of the ozone layer over Antarctica was detected. This rate of decrease has continued. Scientists believe that the original concentrations of ozone will be…
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Did you know?
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When we want water, we just turn on the water tap and out it comes. But water is a very scarce resource. We should not waste or pollute water. Remember, more than 2 billion people do not have access to…
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Minerals (I)
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2.1. What is a mineral? Minerals are solid and inorganic substances which have a particular chemical composition. They are formed naturally. Minerals are characterised by their perfectly ordered…
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Final self-evaluation 03 - The Earth's Crust
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Are the following sentences true or false? The Earth's outermost layer is called the crust. Ocean trenches are long, narrow depressions in the floor of the ocean. The most common elements in the…
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Protists
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The Protista kingdom is made up of unicellular and multicellular organisms such as protozoa and algae. 5.1. Protozoa Protozoa are unicellular organisms that live in aquatic or humid mediums. They can be…
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Final self-evaluation 9.06 - The Plant Kingdom
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Complete the following sentences with the missing words: The is the part of the seed that grows into a new plant. are the most widespread and common type angiosperm plant. The of angiosperms contain the…
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Answer. The simplest invertebrates 1.2
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Compare and contrast the two different shapes of cnidarians.
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Classify. Human beings
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Decide which of the following characteristics refer to humans but not to other primates: They are homeothermic. The spinal column is vertical. All the teeth have a similar shape and size. They have…
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Final evaluation 3 - The Animal Kingdom (II). Vertebrates
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Read the following description: “Carnivorous animal that lives in water when it is a larva and on land when it becomes an adult“. What type of animal does the phrase refer to? What other…
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