Layers dipping at angles up to 45° may be called ______

Tunnels associated with hydropower generation are called ______

Which of the following is not included under preliminary survey?

Traffic tunnels are always constructed for kilometres.

The underground routes or passages driven through the ground without disturbing overlying soil cover are called ______

Which type of geological structure can be rectified by grouting?

Folded rocks are often best storehouses of which of water?

In synclinal condition, low pressure areas are found at ______