Question

why do ponds and lakes in clay areas often appear murky?
clay particles stay suspended in water.
large clay particles settle quickly.
silt stays suspended with no motion.

Explanation:

Clay particles are very fine. Due to their small size and the properties of water (such as surface tension and Brownian motion - the random movement of particles in a fluid), clay particles can remain suspended in water for a long time. When particles are suspended in water, they scatter light, making the water look murky. If particles settled quickly (as in the case of large particles), the water would be clearer. Silt is also a fine - grained sediment, but the option about silt staying suspended with no motion is incorrect because in natural water bodies (ponds and lakes), there is always some degree of motion (e.g., from wind, small currents).

Answer:

Clay particles stay suspended in water.