Question

how deep are ocean trenches ( 8 to 9 km, 10 to 11 km, 11 to 20, 2 to 4 km )​

Answer 1

Answer:

Deep-sea trench, also called oceanic trench, any long, narrow, steep-sided depression in the ocean bottom in which occur the maximum oceanic depths, approximately 7,300 to more than 11,000 metres (24,000 to 36,000 feet). They typically form in locations where one tectonic plate subducts under another.

The deep earthquakes below subduction zones occur in a plane that dips 30° or more under the overriding plate. Typical trench depths are 8 to 10 km (5 to 6 miles). The longest trench is the Peru-Chile Trench, which extends some 5,900 km (about 3,700 miles) along the west coast of South America.

Answer 2

Answer:

approximately 7,300 to more than 11,000 metres

Explanation:

(24,000 to 36,000 feet)