Grade 4 Discover : Set 7 Copy
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The hydrosphere, lithosphere, and atmosphere all contain necessary elements for life to survive.
The Biosphere can be defined as the small space in which the hydrosphere, atmosphere, and lithosphere all meet. It extends from a little below the surface of the Earth until just above it.
The Biosphere is also sometimes called the ‘Ecosphere’ as it is the sum total of all ecosystems on Earth!
What is the one feature of the Biosphere that gives the domain its name?CorrectIncorrect
In June 2019, Sri Lanka launched its first ______ into space called ‘Raavana 1’.
This is defined as an object in space that orbits (circles around) a bigger object. There are also two types: natural (like the moon which orbits the Earth) and artificial (like Raavana 1 which also orbits the Earth)
Nowadays these devices have become very popular and are used to provide services such as Dish TV, GPS, radio, and special cellphones!
What space device are we describing here?CorrectIncorrect
It is estimated that there are 4987 ____ orbiting Earth and one natural one.
If you could build a time machine and go back to the Future, some 2.5 billion years ago, you wouldn’t be able to breathe the air.
You would choke and die within seconds because the Earth’s atmosphere did not contain any of this gas which is essential for life as we know it to survive.
The gas is present in our atmosphere, accounting for 21% of the total gases.
Which gas am I talking about?CorrectIncorrect
Released during the process of Photosynthesis.