Question

When the troughs of tributary glaciers lie above sea level, these hanging valleys can create?

Answer 1

Hanging valleys formed by tributary glaciers lying above sea level can create dramatic waterfalls as they connect with the main valley.

Step-by-step explanation:

When the troughs of tributary glaciers lie above sea level, these hanging valleys can create magnificent waterfalls as they flow down to meet the main valley below. A valley glacier begins at a cirque at the head of a valley or in a plateau ice cap and flows downward between the walls of a valley. This erosion tends to result in U-shaped valleys. The glacier's erosive action can leave tributary valleys at a higher elevation than the main valley floor when the ice melts. When these tributary streams or glaciers flow into the main valley, the difference in height can cause water to cascade down the valley walls, forming prominent waterfalls. Such features are often found in glaciated mountain ranges around the world, and they contribute to the picturesque landscapes of many mountainous areas. For example, in the mountainous terrain of New Guinea, where glaciers exist even at equatorial latitudes, similar features may be observed.

Answer 2

Fjord - A fjord or fiord is a steep water inlet which is narrow. It is created due to glacial erosion. Long ago, when the earth was covered with glaciers, they cut bedrock into U-shaped valleys. As the glaciers moved, they would leave a narrow waterway in their path, due to melting. These waterways are called fjords.