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I'd have to agree with the answer given above. Both lack of sunlight and constant errosion of the surface (incoming waves) erase the newer layers of rock, exposing the darker, older ones.

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What is a black or blue bivalve that attaches itself to rocks in the intertidal zone?

The black or blue bivalve you are referring to is likely a mussel, which attaches itself to rocks in the intertidal zone using byssal threads. Mussels are filter feeders that can be found in coastal areas around the world.


A black or blue bivalve that attaches itself to rocks in the intertidal zone?

This description sounds like a mussel. Mussels are bivalve mollusks that often have dark-colored shells in shades of black or blue. They are commonly found attached to rocks in the intertidal zone, where they feed by filtering plankton and other small particles from the water.


Which rocks would most likely be separated by a transition zone of altered rocks?

Rocks that are typically separated by a transition zone of altered rocks are igneous and metamorphic rocks. The transition zone often forms due to the effects of heat and pressure, which can alter the surrounding sedimentary rocks as they come into contact with molten magma or are subjected to tectonic forces. This alteration results in the formation of new minerals and textures, creating a distinct boundary between the original rock types.


What is the zone where the rocks move deepr and deeper?

The zone where rocks move deeper and deeper is known as the subduction zone. This is where one tectonic plate slides beneath another plate, leading to the recycling of Earth's crust. Subduction zones are typically associated with volcanic activity and earthquakes due to the intense geological processes taking place.


Why are rift zones common places for igneous rocks to form?

The thin crust of a rift zone causes melting in the upper mantle, resulting in volcanic activity.