Final answer:
Sediments from a salty lake with much evaporation are likely to be well-sorted, consisting predominantly of sand and mud. These grains can be well-rounded due to transport or angular if precipitated directly from the saline water.
Step-by-step explanation:
In determining the characteristics of sediments from a salty lake with much evaporation, we focus on sediment size, sorting, and shape. Due to high rates of evaporation in such an environment, we would expect the sediments to be well-sorted and mostly of a smaller grain size, such as sand and mud, rather than boulders or pebbles. These finer sediments indicate a more stable environment where heavier particles have already settled elsewhere. The sorting is typically well because the action of water and wind would have carried away the finer particles, leaving behind more uniform sediment deposits. As for the shape, in salty lakes with significant evaporation, the grains may be either well-rounded due to long transport distances or angular if they're crystalline/chemical in nature and have precipitated directly from the high-salinity water without significant transport.