A. seafloor spreading at mid-ocean ridges
Answer:
Dentistry of gases and mass and distance from sun.
Explanation:
- Out of the 8 planets the earth is an only habitable planet in the solar system till date and thus is called as the blue planet as it has water as the source of life form.
- Other planets like the mars and Venus are likely that of the earth but have a certain amount of variation in their atmospheric composition and characteristics and thus they have different cycles.
- Thus like the variation of the sunlight in the earth equator and the poles, due to the more bulges to the equator areas and less of above.
- Similar is the variation in the gases and the density of the mass of the planets and other four-planet are gas giants and have there own atmosphere surrounded in thick layers.
This shows a cinder cone volcano. It forms when cinders erupt again and again, piling up around the vent to form a steep, cone-shaped hill.
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