Answer:
Petroleum is oil from the remains of water organisms, the oil can be found beneath the ocean floor. Petroleum is a crude oil, and is made of pure chemical compound.
Answer:
To prevent obstruction of rain drops.
Explanation:
The border between the outer core and the inner core is about 5,100 km<span> below the surface of the Earth. (The crust is usually between 3 and 70 km thick, being thicker in the continents and thinner in the oceans,)
Hope this helps, </span>
