47·Ozone is a. 0 b. 02 c. 03 d. 04 48. Heating of the Thermosphere is due to a.

Question

47·Ozone is a. 0 b. 02 c. 03 d. 04 48. Heating of the Thermosphere is due to a. Solar ultraviolet radiation interaction with Ozone b. Solar ultraviolet radiation interaction with light elements like Hand He c. Solar ultraviolet radiation interaction with CO2 d. the Earth's magnetic field. 49. The Moho is the boundary between a. The outer core and the mantle b. The lithosphere and the asthenosphere c. The ocean crust and the continental crust d. The crust and the mantle 50. The angle of repose of sand is a. 64 b. 54 C. 44 d. 34 51. (4 pts). The oldest rocks found on Earth are age was determined using the radioactive decay of what element to what element? -years old and their 52. Which feature does not have gravel-sized material in it? a. Kame b. Esker c. Moraine d. Drumlin 53. The highest stream velocity occurs when the stream is a. Farthest from its base level b. In high mountain streams c When it arrives at its respective base level. d. At the mid-point or equilibrium point of a stream 54. A kettle is formed by a. sediment being deposited around a remnant block of ice b. dissolution of limestone c. the cutoff of a stream in a meander loop. d pioneers who left cooking materials behind

Explanation / Answer

47. Ozone is:

Answer is Option(c)- The chemical formula of Ozone is O3. Ozone is chemically Tri-Oxygen. It is an inorganic chemical, and an allotrope of Oxygen. It is very unstable, and breaks down in the lower atmosphere.

48. Heating of Thermosphere is due to:

Answer is Option (a)- Thermosphere, which extends between 90-500 km from the Earth surface has termperature as high as 1000 degrees Celsius. At this layer, due to the relative absence of molecules and atoms, even a small amount of absorption of sun's rays can significantly increase the temperature. In this layer, the Oxygen molecules absorb the sun's rays and contributes the increase in temperature with the altitude.

49. The Moho is the boundry between:

Answer is Option (d)- The Crust and the Mantle. This layer is named after the Seismologist, Andrija Mohorovicic. This is also called Mohorovicic' Discontinuity. This is a layer at which the seismic waves change velocity. The boundry is between 25 and 60 km beneath the continents, and 5 and 8 km beneath the Ocean Floor.

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