Some more info...
Job:
1 Can you pull in the leviathan with a fishhook or tie down his tongue with a rope?
2 Can you put a cord through his nose or pierce his jaw with a hook?
7 Can you fill his hide with harpoons or his head with fishing spears?
The point of the above three verses is that NO...you cannot do these things to the Leviathan. You could, however, do it to a crocodile, whale, serpent, etc.
12 I will not fail to speak of his limbs, his strength and his graceful form.
14 Who dares open the doors of his mouth, ringed about with his fearsome teeth?
15 His back has rows of shields tightly sealed together;
16 each is so close to the next that no air can pass between.
Anthropomorphism. Unknown natural events were anthropomorphised then. Everything they did not understand was worshipped or feared and given animal, human or divine (or all) characteristics. Animals they did know about and did fear were used to describe things they didn't know about and did fear. That is why the leviathan is described using descriptors of crocodiles and also called a serpent. They didn't have the terminology needed as they didn't know what land or marine volcanoes were so they used the terminology they did have. Scary things were called serpents because snakes were scary. It's a bit like swearing.
19 Out of his mouth go burning lamps, and sparks of fire leap out.
20 Out of his nostrils goeth smoke, as out of a seething pot or caldron.
21 His breath kindleth coals, and a flame goeth out of his mouth.
Pretty blatant descriptors of an underwater volcano.
23 The flakes of his flesh are joined together: they are firm in themselves; they cannot be moved.
The scales/flakes of his flesh....the dark rough surface of the underwater volcano, which may at times have risen above the surface (creation of land). They thought it was a monster. They thought the dark rough stuff they saw was the monster's scaly skin. They noted that it didn't move and decided that must have been because the scales were so tightly compacted. It never entered their heads that it didn't move because it was a volcano. They didn't know about land volcanoes let alone submarine ones.
25 When he raiseth up himself, the mighty are afraid: by reason of breakings they purify themselves.
Crocodiles do not raise themselves up but crawl along. Underwater volcanoes raise themselves up as they erupt and create plumes of water and ash, and create new land.
26 The sword of him that layeth at him cannot hold: the spear, the dart, nor the habergeon.
Crocodiles are not impervious to spears. Volcanic rock is.
27 He esteemeth iron as straw, and brass as rotten wood.
This Leviathan can destroy anything. Have you ever known a crocodile to chew up an iron bar as though it was straw?
28 The arrow cannot make him flee: slingstones are turned with him into stubble.
This Leviathan cannot be moved by hook or by crook.
30 Sharp stones are under him: he spreadeth sharp pointed things upon the mire.
How many crocodiles spew out 'sharp pointed things'...or brimstone?
31 He maketh the deep to boil like a pot: he maketh the sea like a pot of ointment.
The crocodiles were so hot they could brew up a tea? They relieved themselves in the water so it became murky?
32 He maketh a path to shine after him; one would think the deep to be hoary.
A path to shine after him? The crocs laid a flourescent path after they crawled along or an underwater volcano produced rivers of glowing lava and plumes of ash clouds? Hoary means 'white hair'. Yahweh was also described as white haired and also had smoke coming out of his nostrils.