| geology(noun, study, science, knowledge, classification) |
| deep sea(noun, expression, crack, water, opening) |
| ocean(noun, crack, water, opening, rift) |
| water(noun, crack, opening, rift, fissure) |
| deep(noun, crack, water, opening, rift) |
| environment(noun, water, sea, planet, habitat) |
| abyssal zones(noun, expression, crack, water, opening) |
| abyssal zone(noun, expression, crack, water, opening) |
| crack(noun, water, opening, rift, fissure) |
| fissure(noun, crack, water, opening, rift) |
| hadal zone(noun, expression, crack, water, opening) |
| hadal zones(noun, expression, crack, water, opening) |
| hole(noun, crack, water, opening, rift) |
| hotspot(noun, crack, water, opening, rift) |
| hotspots(noun, crack, water, opening, rift) |
| marine habitat(noun, expression, crack, water, opening) |
| marine habitats(noun, expression, crack, water, opening) |
| mid-ocean ridge(noun, expression, crack, water, opening) |
| mid-ocean ridges(noun, expression, crack, water, opening) |
| ocean basin(noun, expression, crack, water, opening) |