25. Assume spent Uranium with a density of 19000 kg/m3 is buried in soil with a

Question

25. Assume spent Uranium with a density of 19000 kg/m3 is buried in soil with a density of 1500 a. b. C. d. kg/m within large metal containers 200 ft beneath the surface in Texas. What would you expect from a gravity survey designed to locate the containers? Strong negative gravity anomaly Strong positive gravity anomaly No anomaly because of the low density of Uranium relative to soil Negative anomaly due to the large volume of low density soil 26. The magnetic field of the earth is most likely generated in the a. lithosphere b. asthenosphere c. mantle core 27. A mountain is 3500 M high. Assuming perust-2800kg/m3 and pmantle = 3300 kg/ what is the depth of the low density root beneath the mountain for isostatic equilibrium? a. 3.5 km b. 19.6 km c. 24 kmm d. 12.67 km 28. What is the primary reason that the magnetic anomaly of a rectangular prism of magnetic material, at a depth of 2500 meters, differs as latitude changes? a. The effect of the Sun's magnetic field changes with latitude b. The declination of the earth's magnetic field changes with latitude c. The inclination of the earth's magnetic field changes with latitude d. True anomalies only occur at the poles and equator 29. In order for symmetrical patterns of magnetic polarity to be produced in the vicinity of a mid- oceanic ridge: a. new crust has to be produced continuously at the ridge b. the oceanic crust must move away from the ridge in opposite directions C- the earth's magnetic field must periodically reverse itself d. all of the above 30. What period in earth history did the first land plants appear? b. Jurassic d. Silurian

Explanation / Answer

25. The correct option is b. As we are seeing that the uranium density is very high as compared to the density of soil and hence we’ll see a positive anomaly.

26. The core contains liquid iron and nickel and there’s a convection current inside the core due to which the liquid iron and nickel moves inside the core which produces the magnetic field of earth and hence option d is correct.

27. Density of crust/Density of mantle = 2800/3300 = 0.8484

1-0.8484 = 0.1515

This means about 0.1515 of total material is mountain which is equal to 3500 meter and 0.8484 of the total height is below the mountain which is equal to:

(3500/0.1515) x 0.8484 = 19,600 meters

28.

The correct option is c as earth’s magnetic field inclination changes with latitudes.

As per Chegg’s policy we are advised to attempt the first four parts of a questioner, please post the remaining questions as a different questioner. Thanks

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