Question 1 :
The resources available from seas and oceans are called marine resources.<br>

Question 4 :
The world's deepest point is in Mariana Trench in Pacific ocean at a depth of _________ below the sea level.

Question 5 :
Consider the following statements regarding asteroids:<br>$1$. Asteroids are rocky debris of varying sizes orbiting the sun.<br>$2$. Most of the asteroids are small but some have diameter as large as$1000$km.<br>$3$. The orbit of asteroids lies between orbits of Jupiter and Saturn.<br>Which of these statements is/are correct?<br>

Question 6 :
<p><span>Atmosphere is classified into different zones, which of the following is not among this classification?</span></p>

Question 7 :
The atmosphere of the earth is heated by radiations which are mainly:

Question 11 :
Earth travels around the sun at a speed of _____ kilometres per hour.

Question 13 :
At a speed of 1,07,200 km per hour, the earth travels around the sun to complete one _____.

Question 14 :
Through the process of photosynthesis plants absorb ___ from the atmosphere and release ___ into it.

Question 16 :
When was the last supernova in the Milky Way well observed?<br>

Question 17 :
The group of&#160;small pieces of rock revolving round the sun between the orbits of&#160;Mars and Jupiter are called _______.

Question 18 :
Assertion: Electromagnetic waves with frequencies smaller than the critical frequency of ionosphere cannot be used for communication using sky wave propagation. Reason: The refractive index of the ionosphere becomes very high for frequencies higher than the critical frequency.