Đây là một đoạn trích hay trong BST Đề thi Olympic Tiếng Anh lớp 4 vòng 10 đề thi số 1 năm học 2012. Mời quý thầy cô và các em học sinh tham khảo:
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invisible [in-'viz-uh-buhl] adj - cannot be seen by the eye; not visible. Goodwill is an invisible asset to a business.
magma ['mag-muh] noun - molten material beneath or within the earth's crust, from which igneous rock is formed.
diamond ['dahy-muhnd] noun - a nearly pure, extremely hard form of carbon, naturally crystallized in the isometric system.
outermost ['ou-ter-mohst] adj - farthest out; remotest from the interior or center. The outermost limit of the city is dessert.
predict [pri-'dikt] verb - to declare or tell in advance; prophesy; foretell. The weatherman's job is to predict the weather.
temperature ['tem-per-uh-cher] noun - a measure of the warmth or coldness with reference to some standard value. In a hot summer, the temperature in Houston can be as high as 100 °F.
violent ['vahy-uh-luhnt] adj - acting with or characterized by uncontrolled, rough force. A violent earthquake destroyed the small town completely.
dormant ['dawr-muhnt] adj - asleep; in a state of rest or inactivity. The lecturer's sudden shout woke the dormant audience.
A volcano is a natural wonder that can be both harmful and helpful to living things. Read the article about volcanoes.
It begins when ____ 1 ____ gases escape from an opening at the mountain’s top. Then, a huge explosion fills the air. A cloud of steam, ash, and burning rock bursts out of the crater created by the blast. The sky becomes dark. Dust and ash block the Sun. Hot melted rock gushes over the sides of the crater and travels down the mountain. A volcano has erupted.
A Volcano Is Born
Active volcanoes, like the one described above, are often large mountains. When a volcano is born, however, it starts out as a crack in the surface of Earth. Hot, melted rock from deep inside Earth rises and pushes through this crack. This melted rock, called ____ 2 ____, forces its way out. The magma is now called lava. The lava cools and becomes hard. Over many years, the dried lava builds up into layers. After a while, these layers form a tall mountain. These volcanic mountains can form on dry land or under the sea on the ocean floor. Volcanic mountains born under the ocean can become islands. People think the island of Hawaii was formed this way.
Most volcanoes form along the largest cracks in Earth’s surface. Earth’s ____ 3 ____ layer (the crust) is made up of sections called plates. Plates float slowly on the liquid magma. The world’s continents are on these plates. As the plates move, melted rock can push its way through the places where they meet. A string of volcanoes has formed along the edges of a large plate. This area is known as the Ring of Fire. California and Alaska are located along the Ring of Fire.
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