Question

what causes dissolved oxygen levels to rise in fast moving rivers and streams? increased sediment amounts absence of all aquatic life warmer water temperature the rapid water movement

Explanation:

• Increased sediment amounts: Sediment can reduce light penetration and may lead to lower oxygen - related processes (like photosynthesis by aquatic plants), so it doesn't cause an increase in dissolved oxygen.
• Absence of all aquatic life: Aquatic life (both plants and animals) play roles in the oxygen cycle. Plants produce oxygen through photosynthesis. An absence of all aquatic life would disrupt the normal oxygen - related processes and not cause an increase in dissolved oxygen.
• Warmer water temperature: Generally, warmer water holds less dissolved oxygen. So this is not a factor for an increase in dissolved oxygen.
• The rapid water movement: When water moves rapidly (e.g., in fast - moving rivers and streams), it increases the surface area of the water in contact with the air. This allows for more oxygen from the air to dissolve into the water.

Answer:

the rapid water movement