"which rock type is associated with a high- energy environment (such as a very turbulent stream)? "

The rock type which is associated with a high- energy environment such as a very turbulent stream is called conglomerate rock. This sedimentary rock contains large rounded clasts. Small particles and/or chemical cement bind the rock together. These kinds of rocks may vary according to their compositions. These clasts which are round may be minerals such as quartz or these could be sedimentary, metamorphic, or igneous rock fragments.  And the large clasts may be because a mixture of sand, mud and chemical cement bonded them together. These rocks are formed when sediments of rounded clasts of at least two millimeters in diameter accumulate.