Answer: Option [C]The correct answer is west to east. Earth rotates from west to east. Therefore, in terms of time the eastern part of the earth is ahead of the western part.
Answer: Option [B]Mohs scale is used to determine degree of hardness of minerals. Mohs scale is a scale used to measure the relative hardness of a mineral by its resistance to scratching. From softest to hardest, the ten minerals of the Mohs scale are talc (measuring 1 on the scale), gypsum, calcite, fluorite, apatite, orthoclase, quartz, topaz, corundum, and diamond (measuring 10 on the scale).
Answer: Option [D]The correct answer is the moon, the sun and the earth in the same line. Spring tides always happen when the Moon is at the full or new phase, which is when the Sun, Moon and Earth are in alignment. Neap tides occur around the first and last quarter phase of the Moon, when the Moon's orbit around Earth brings it perpendicular to the Sun.
Answer: Option [A]Total surface area of the earth in square kilometer is 510.1 million square kilometer. According to modern estimates, the surface area of the Earth is approximately 510 million square km (5.1 x 108 km2) or 196,900,000 square miles.
Answer: Option [B]The Earth while rotates around the Sun It always keeps its axis pointed towards the pole star. The earth, while rotating around the sun, always keeps its axis pointed towards the Pole Star. The Pole Star is a bright star that is always directly above the north pole and which remains in the same position round the clock and throughout the year in the sky.