Which is a reason that we s a reason that we suspect that the extinction of the

Question

Which is a reason that we s a reason that we suspect that the extinction of the dinosaurs was caused by an explosive Question 7 object? Many dincesaur fosils are found bekow the K-T boundary, but none above it All of these An impact crater has been found near Mexico's Yucatan Peninsula The material in the K-T boundary is rich in iridium Question & A True Nebular theory predicts that other solar systems that formed in the same way should also have8 planets False Question 9 Approximately how much mass is there in the planets, coenpared to the mass of the Sun? & percent less than 1 percent e 25 peroent 10 percent Question 10 How does the fraction of oxygen in Earth's atmosphere today compare to what it was 3 billion years ago? It has significantly increased It hasm't changed It has significantly decreased Question 11 The lithosphere of a planet is the layer of the atmoophere in which clouds forna it sod surface the molten layer under the crust Dits froam sarface the upper layer of its atmosphere Question 12 What is the age of our Solar System? 4.6 bllion years 13.7 million years 13.7 trillion years 4.6 million years 13.7 billion years Question 13 The greeshouse effect is the trapping of infrared radiation by the atmoephere capturing of visible and UV radiation from the Sun the atmosphere shielding of life forms from solar UV radiation ly the ooone layer accentuated growth of plants near the equator, compared to other regions Question 14 False True The polar caps of Mars shrink and grow with the changing seasons

Explanation / Answer

7. The event which triggered sudden atmospheric changes due to which the dinosaurs got extinct was projected to occur during the cretaceous and tertiary time period. Moreover, the extra terrestrial impact caused the element iridium to get concentrated over the impact regions. That is why the event is generally called the KT extinction event. So the correct option out of the given ones is (b).

8. Nebular theory proposes that the planets are formed due to the condensation of gases produced by the planetesimals. So there is no such neccessity to limit the number of planets formed in any solar system. Therefore the statement in the given question is FALSE.

9. The percentage of the whole planetary system if compared to sun with respect to the mass, then it would be less than 1 percent. So the correct answer would be (b).

10. The oxygen percentage of the earth if it is compared to the days during the period which was 3 billion years ago, then it would be that the percentage has ceratainly increased as the number of biological percentage of living organisms utilising such kind of oxygen has also increased.

11. The lithosphere is generally termed as the semi viscous layer of the external part of the earth containing both the oceanic and continental parts in it. Therefore the correct option out of the given ones is (B) as the other options doesnt fully satisfy to get eligible for being a lithosphere.

12. The calculated age of the solar system as given by the nebular hypothesis is 13.7 billion years. So the correct option is (E).

13. The Greenhouse effect is termed as the trapping of the heat rays coming from the sun by the production of the trapping gases like that of carbon dioxide, sulphur dioxide etc. This is considered to be one of the burning concerns for the change in the climatic condition throughout the globe. Hence the correct option out of the given ones would be (a).

14. First of all, till date there is no such evidence which can prove the existence of climate at the planet mars. So there is no question to show any change in climatic condition in its surface. Therefore the correct option would be False.

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