Which of the following is true about river capture

1.It is caused by Tectonic movements

2.It is also cause river beheading

Which of the following is/are correct? Select the correct ans from the code given below

a)1 only

b)2 only

c)Both 1 and 2

d)Neither 1 nor 2

Ans-[C]

Explanation- Stream capture, river capture, or stream piracy is a geomorphological phenomenon occurring when a stream or river drainage system or watershed is diverted from its own bed, and flows instead down the bed of a neighbouring stream. This can happen for several reasons, including:

• Tectonic earth movements, where the slope of the land changes, and the stream is tipped out of its former course
• Natural damming, such as by a landslide or ice sheet
• Erosion, either
  • Headward erosion of one stream valley upwards into another, or
  • Lateral erosion of a meander through the higher ground dividing the adjacent streams.
  • Within an area of karst topography, where streams may sink, or flow underground (a sinking or losing stream) and then reappear in a nearby stream valley

The additional water flowing down the capturing stream may accelerate erosion and encourage the development of a canyon.