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True / False. The cerebrum
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Are these sentences true or false? The cerebrum is the most important nervous centre in our body. It contains nearly one million neurons. The outer surface, which is 1.5 to 4 millimetres thick, is…
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The beginning of life
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1.1. The Earth, our planet The Earth is the only planet in the Solar System that has all of the conditions for life to develop. These conditions are the following: Its size, which allows the force of…
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Rock types
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Sedimentary rocks Common salt is made when sea water evaporates. It is extracted from salt mines. Sandstone is a sedimentary rock made up of grains of sand that are held together by other mineral…
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End-of-unit activities - The Hydrosphere
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The hydrosphere is the part of the Earth where water can be found. This water includes oceans, seas, rivers, lakes, snow, ice, groundwater and water vapour in the atmosphere. The Earth is the only…
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End-of-unit evaluation - The Universe and our Solar System
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Since ancient times, humans have tried to explain the nature of the Universe. For centuries it was thought that the Earth was a flat surface. People believed that everything in the sky rotated around…
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Final Autoevaluation T07 01 - Energy inside the Earth
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Answer true or false: The Earth's interior is hotter than the surface. Tectonic plates are about 100 meters thick. Most tectonic plates have continental and oceanic parts. The most active areas of…
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Parts of the atmosphere
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The atmosphere is a layer of gas with a variable thickness. It surrounds the Earth. There are five parts, or layers. The five layers of the atmosphere are the troposphere, the stratosphere, the…
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Complete. Atmospheric conditions
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Choose the best word to complete the following sentences: is the weight of the air on the planet's surface. Atmospheric pressure depends on and . Warm air weighs less and is less dense, which makes…
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Volcanoes
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2.1. Volcanoes Volcanoes are formed when magma rises to the surface of the Earth (figure 1). During an eruption, there are explosions when gases escape from the magma. The lava pours out and forms lava…
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Unit 12: Waves. Light and sound
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Amplitude (n): the distance between a crest or a trough and the equilibrium position of a wave. converging lens (n): a lens which concentrates the light which passes through it. deafness (n): not being…
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