What is the definition of Lithosphere?, It is the thin layer of soil and rocks covering Earth., What is the definition of hydrosphere??, It contains all the water found on Earth in rivers, and lakes and oceans and in the air in the form of water vapour., What is the definition of atmosphere?, It is the thin layer of gases that surrounds Earth., What is the definition of biosphere?, It is made up of all the areas on Earth where life exists., What does the Biosphere contain?, 1. parts of teh lithosphere, the hydrosphre and the atmosphere that support life. 2. all teh living organisms on Earth. 3. dead organic matter., What is the biosophere divided into and what is it called?, smaller units called ecosystems., Name the 5 requirements for sustaining life., 1. energy. 2. gases. 3. water. 4. soil. 5. favourable temperatures, Explain why energy is a requirement for sustaining life., 1. Energy allows livign organisms to move, grow or carry out life processes. 2. The ultimate source of energy is the sun. 3. Plants make their own food using energy from the sun in process photosynthesis. 5. They store energy as starch., Explain why gases are a requirement for sustaining life., 1. Both carbon dioxide and oxygen are gases that are found in teh atmosphere. 2. They are also found dissolved in water. 3. Most organisms need oxygen for respiration., Explain why water is a requirement for sustaining life., 1. Living organisms need water to survive. 2. Water in your blood carries food and chemicals around your body. 3. It gets rid of waste and cools you down. 5. Plants use water to grow and transport food and for photosynthesis., Explain why soil is a requirement for sustaining life., 1. plants need soild to survive. 2. they get water and nutrients from soil. 3. many animals live in the soil eg: earthworms and beetles and bacteria. 4. Animals living in the soil help to improve the quality of the soil., Explain why favourable temperatures are a requirement for sustaining life., 1. Earth's stable temperatures sustain life. 2. every species on Earth grows best in a particular range of temperature. Eg: polar bears live in very cold climate and giraffe live in warmer climates., How is seaweed adapted to its environment?, 1. Kelp has a holdfast that keeps them attached to rocks. 2. The stems are long and flexible and not easily broken. 3. the leaves called fronds are held up to the light for photosynthesis., How is Gemsbok adapted to its environment?, 1. it can survive for weeks without water. 2. they get enough water from palnts they eat and feed early in the morning when plants have droplets on them. 3. The blood is cooled by being passed through a network of blood vessels in the nose. 4. they have long horns for protection, How is camelthorn adapted to its environment?, 1. it has long roots that reach water deep underground. 2. it has small leaves to reduce water loss. 3. it has long thorns to protect the leaves from being eaten. 4. the seeds have thick coat so they are not digested in the stomach., How is social weavers adapted to its environment?, 1. they seldom need to drink water. 2. they build their nests in big communities to keep cool in the day and warm at night. 3. nests protect the birds form high daytime tempretures.

Grade 7 - TOPIC 1

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