Answer:
grew crops as a food source
Answer:
a)what is humus?
ans-the dead and decayed parts of plants and animals are called humus..
b)explain about plate tectonic theory.
ans- The theory of plate tectonics states that the Earth's solid outer crust, the lithosphere, is separated into plates that move over the asthenosphere, the molten upper portion of the mantle. Oceanic and continental plates come together, spread apart, and interact at boundaries all over the planet.
Answer:
B.
C.
Explanation:
Factors control the cooling time of magma within the crust include surface water passing over the magma and the depth at which the magma cool.
Surface water passing over the magma absorbs the water and carries away heat and magma present in depths is cooler than surface because magma rises to earth surface due to high pressure and that is hot.
Hence, the correct option is "B. and C."
A fixed hot spot currently situated under Hawaii across which the Pacific plate is moving in a northwesterly direction
