Answer:
(a) Clastic sedimentary rock.
(b). Gradualism.
Explanation:
A
They can be refered as Clastic sedimentary rocks, they also exist as
breccia, conglomerate, sandstone ,
siltstone, and shale are formed from mechanical weathering debris.
(b).Similar to other Sierra Nevada tributaries, the Merced River transitions from steeper, gravel bedded
reaches affected by gold dredging and aggregate mining, to areas where various activities have
encroached on the stream channel, and then to a lower gradient sand bedded reach.
The sediments are transfered gradually from the stream directly to the main river.
