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Echinoderms
EduBook Organización
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3.1. Echinoderms Echinoderms are animals that live at the bottom of the sea. They do not have a head. They have an external skeleton consisting of plates with spines. The majority of echinoderms have a…
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The Human Development Index
EduBook Organización
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The Human Development Index (HDI) uses statistics about life expectancy, education and per-capita gross domestic product (GDP) to rank countries according to their level of development. The HDI uses a…
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Complete. The vertebrae
EduBook Organización
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Complete this text with the correct words: The vertebrae are 33 bones that form a column down the centre of our back, called the column. There are 7 bones at the top of the spinal column that form our .…
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The origin of coal
EduBook Organización
- 2445 visitas
Much of the coal on Earth was formed 300 million years ago, during the Carboniferous period. The coal was formed where the climate was hot and humid, and there were extensive areas covered in lush…
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The EU comes to the aid of fragile marine ecosystems
EducaMadrid Organización
- 1 lo usan
- 4472 visitas
Bottom fishing gears damage vulnerable marine ecosystems in the high seas. The EU has already taken measures to protect deep sea corals and other vulnerable habitats in European waters in the Atlantic,…
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Learn. Observe thermal equilibrium
EduBook Organización
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What do we need? Three glass containers A thermometer A glass rod What do we do? Put hot water in one of the containers (A) and cold water in the other (B). Measure the temperature of the water in both…
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Find out more
EduBook Organización
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Boiling and evaporation are different processes. Both change a liquid to a gas, but happen in different ways. Water boils at 100°C. During boiling, the total volume of liquid water is changing to water…
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Before you read Ch 03 01 - A Surprise Arrival
EduBook Organización
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Look at the pictures below. They show the kinds of boats you might see on the Mississippi River. Match the correct word for each boat. Now match the definitions below to one of the pictures above. A…
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Think about it. Materials that conduct and insulate heat
EduBook Organización
- 3285 visitas
Remember what you have studied in this section and answer the questions: Why do we put radiators at the bottom of the wall in a room, and air conditioning at the top? What is the fastest method of heat…
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