Earth - Study Mode

[#226] The Gutenberg discontinuity is between ________
Correct Answer

(C) The outer core and the lower mantle

Explanation

Solution: Gutenberg established an accurate boundary line or discontinuity that separates and divides the lower mantle from the outer core. The lower mantle above the Gutenberg line is solid, but the outer core below the line is liquid molten.

[#227] The approximate circumference of the Earth is
Correct Answer

(D) 40,000 km

Explanation

Solution: The approximate circumference of the Earth is 40,000 km. The circumference of the Earth in kilometers is 40,075 km, and the circumference of the Earth in miles is 24,901.

[#228] For a time difference of two hours, the longitudinal distance will be equal to ________.
Correct Answer

(B) 30°

Explanation

Solution: One hour of time difference corresponds to 15° of longitude (360°/24 hours = 15°/hour). Therefore, For a time difference of two hours, he longitudinal distance will be equal to 30°.

[#229] When it is 12 noon at Greenwich, what is the time at New York (74° W) ?
Correct Answer

(D) 7.04 a.m.

Explanation

Solution: Greenwich is 4 hours ahead of New York, NY, USA. Greenwich mean time (GMT) = 12 noon every 1° is equal to 4 minutes. therefore, 74° = 74×4 = 296 minutes. Therefore, When it is 12 noon at Greenwich, the time at New York (74° W) is 7.04 a.m.

[#230] What is the difference between the Local time and Greenwich time one degree longitude?
Correct Answer

(B) 4 minutes

Explanation

Solution: The time difference between each longitude (each degree) is 4 minutes. So if it is 12 noon at Greenwich (0°), it would be 12:04 pm at 1° meridian and so on.