________ are generally built in pairs to preserve the location of a river mouth or harbour entrance.

Question

Quizplus · Accepted Answer

Jetties are built in pairs to preserve the location of a river mouth or harbor entrance. They are constructed perpendicular to the shoreline and extend out into the water, creating a channel for boats to travel through, while also helping to prevent sediment buildup at the harbor entrance. Seawalls and groins, on the other hand, are typically not built in pairs and serve different purposes. Seawalls are designed to protect the coastline from erosion and storm surge, while groins are used to prevent beach erosion by trapping sediment. Caissons are large concrete structures used to form the foundation of bridges or other large structures.

________ Are Generally Built in Pairs to Preserve the Location