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Work Sheet-Please Try Out

Earth And Its Neighbours (7.1)
A. Write the number of the correct answer in the brackets.

1.	The ________ of the Earth creates day and night.		()
	(1) (2) (3) (4)	revolution rotation roundness orbiting
2.	At any time, ________ of the Earth's surface is having daylight.		()
	(1) (2) (3) (4)	one-quarter one-half two-third three-quarter
3.	Although the Sun is many times larger than the Earth, it appears to be small because ________.		()
	(1) (2) (3) (4)	it is very far away it is very bright there are many planets it is blocked by clouds
4.	The planet furthest away from the Sun is ________.		()
	(1) (2) (3) (4)	Mercury Neptune Pluto Uranus
5.	The Earth is the ________ planet away from the Sun.		()
	(1) (2) (3) (4)	second third fifth sixth

B. Write "T" for true and "F" for false.

1.	Like all planets, the Sun has its own orbit.	()
2.	The Sun provides heat and light to the Earth.	()
3.	Clouds in the sky fall as rain to Earth.	()
4.	Mars has only one moon.	()
5.	The Moon is slightly larger than the Earth.	()

C. Fill in the blanks with the most suitable word.

1.	Objects which move around the Earth in space, such as the Moon, are known as _______________.
2.	When we are on Earth, we see the Sun rises in the _______________ every morning.
3.	The Sun, the nine planets and the moons form the _______________   _______________.
4.	The planet with a ring around it is _______________.
5.	The Earth revolves around the Sun once every _______________ days.

Chapter 2:Learn about Global Warming

Global warming is when too much heat gets trapped in the Earth’s atmosphere, causing a disruption to our ecological systems. It is similar to what is called the greenhouse effect. In a greenhouse, sunlight is trapped inside to cultivate plant growth and reproduction. However too much heat or sunlight will cause temperature levels to rise and ruin the ecosystems. Plants and animals will die, and we will lose our sources of food.

What causes global warming?

Global warming is the end result of man’s insatiable appetite for using up resources. There are many reasons why global warming occurs today. One of the major reasons is the consumption of too much energy. When you do not unplug the computer before going to bed, this eats up more electricity than necessary. The same thing happens when too many cars run on gas or petrol, televisions are left on while no one’s around or water is let drip from a faucet. All of these activities require energy. To produce energy, we use up fossil fuels that are dug right from the ground. Fossil fuels are produced from decaying plants and animals. When oil from fossil fuels is burned, it creates a dreadful odor that pollutes the air we breathe. Moreover the end results of used up fuels can also pollute our water. As energy is used up the chemicals emitted cause the Earth to behave similarly to a greenhouse, thus the term greenhouse gases.

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Chapter 1:

Learn about Photosynthesis

Very few plants can actually trap their own food and none can go grocery shopping so plants need to make their food by themselves if they want to eat! Plants are fortunate as they are the only living organisms that can make their own food. How do they do this?

They make their food by combining carbon dioxide gas that is found in air with water and nutrients that they absorb from the soil.

In order to do this though they need energy – which they get from sunlight. The energy from sunlight (solar energy) is used by the plant to make carbon dioxide and water react chemically together and change into glucose (food) and oxygen. This process is called photosynthesis. The word photosynthesis comes from two Greek words: photo meaning light and synthesis meaning putting together so photosynthesis means “putting together with light”.