The ring of fire, where most active volcanoes are, is in the <span>Pacific Ocean.</span>
D. Asteroids vary greatly in size and are mostly made up stone, iron and nickel
Nitrogen-fixing bacteria fix atmospheric nitrogen to ammonia, which can then be taken up by plants.
- The process is called biological nitrogen fixation.
- Rhizobium, Azotobacter, cyanobacteria are some examples of nitrogen-fixing bacteria, which may be free-living or symbiotic.
First is the Nebula, a cloud of gas and dust in space where stars are born.
Second is a Star, Luminous globe of gas producing its own heat and light through nuclear reactions.
Third is Red Giant, a large bright star with cool surface, it is formed during the later stage of evolution of a star like our sun.
Fourth is the Red Dwarf, which is very cool, faint and small star.
Fifth is White Dwarf, this is a very small and the last stage in the life cycle of a star.
Sixth is the Supernova, the explosive death of a star
Lastly is the Blackhole, where it is believe to form from a massive stars at the end of their times
