Help in question 27 ( class 9, physical features of India )
Answers
a) Atoll
b) Catchment area
c)Basin
d) Gerge/canyon
WHAT IS ATOLL?
This circular type of coral reef, called an atoll, is created as a ring of coral surrounds an undersea volcano that has risen above the water's surface. Long after the volcano has receded into the ocean, the atoll remains. The habitat inside the atoll, protected from the open sea by the sturdy reef, is called a lagoon.
What is catchment area?
River basin, catchment area and watershed
Generally, the area drained by a river and its tributaries is called its river basin or catchment area or a watershed.
WHAT IS BASIN?
A drainage basin is any area of land where precipitation collects and drains off into a common outlet, such as into a river, bay, or other body of water.
What is canyon?
Most canyons were formed by a process of long-time erosion from a plateau or table-land level. The cliffs form because harder rock strata that are resistant to erosion and weathering remain exposed on the valley walls.
Answer:
Still
catchment
basin
Gerge/ canyon