what forms of stone are created by rivers and seas?
through a process of wearing away and smoothing down the stones increasingly lose their shape: the sea casts the stones from the mountains, which the river had carried to the sea, back against the mountain face upstream. and the river carries the stones back again toward the sea. this is how round stones are formed, for all the stones being transported knock against each other. the smaller the stones are or become, the farther they have traveled on their journey from their point of origin, the mountains. small stones gradually become sand, and eventually silt. sand and silt become mixed with the earthÕs salt, in the first case becoming rock, and in the second case becoming tufa.
earth
- is the earth a living body?
- why is there ebb and flow in the atlantic and the mediterranean?
- how did the different forms of rock develop?
- why can't the moon be responsible for ebb and flow?
- does ebb and flow occur when two rivers meet?
- did the rivers carve up the mountains?
- why is it that an object that would sink in calm water does not sink in moving water?
- how did the strait of gibraltar and the sinai mountain range come into being?
- how can one discover the origin of ebb and flow?
- can one influence the confluence of two rivers?
- which waves are particulary strong when a river swells up?
- how does water flow around two obstacles standing one after another?
- does a stone sink vertically to the bottom when its dropped into moving water?
- how can one make the movements of water visible?
- how does water flow around two obstacles standing near each other?
- how does water flow around three obstacles in a triangular formation?
