pioneering - using ideas and methods that have never been used before, shed new light - to provide information about sth or to make something easier to understand, layer - a thin sheet of a substance, tether - tie someone/something, tow - pull a car, boat, etc. along, fastened behind another vehicle or boat, fissure - a deep, narrow crack, especially in rock or the earth, plate - one of the parts of the earth's surface that move in relation to each othera large crack in the ground or in rock, rift - a large crack in the ground or in rock, trench - a long, deep valley at the bottom of an ocean, converge - move towards the same point where they join or meet, murky - dark and dirty or difficult to see through, conversely - in an opposite way,

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