B. is a long crack, which releases lava, steam, and gases
Explanation:
A fissure is a long crack which releases lava, steam and gases into the environment. Fissures are mostly associated with volcanic bodies.
A volcano is an igneous structure by which lava erupts on the earth surface.
- most volcanoes have fissures through which they release materials into the environment.
- these features are usually permeating cracks into the deeper magmatic body.
- they often times acts as conduit for magma to reach the surface.
- in a volcanic terrain, fissures can provide good clues to the occurrence of an eruption.
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volcanic bodies brainly.com/question/5055821
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Nucleus is the answer
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