Kepler's first law means that planets move around the Sun in elliptical orbits.
Terracing of hillside is most often used in B. agriculture.
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The mountain ranges and rivers in Southeast Asia have made a stripe like relief in the mainland of this region. The mountain ranges are in a north-south direction and separate the region into few big elongated valleys, and the 5 big rivers also are moving from the north towards the south (southeast, southwest as well), and are running in between the mountain ranges and cut through the valleys.
The answer is a) manganese nodules
