Sedimentary rocks.
No, rocks made of sediments are called sedimentary rocks. Igneous rock comes from volcanic activity -- lava and the like.
conglomerate
Not all rocks are, only sedimentary rocks are truly made up of sediments. Some metamorphic rocks do because they are formed when heat and pressure are applied to sedimentary rocks, which makes sediments the basis of these rocks as well
Sedimentation
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sandstone
The breaking up of rocks into sediments is called weathering. Weathering can be physical (mechanical) or chemical in nature, and it is a key process in the formation of sedimentary rocks.
These rocks are called detrital or clastic.
conglomerate
Sediments
Ocean water breaks rocks into sediments
Ocean water breaks rocks into sediments