Our Changing Earth - Class 7 Geography - Extra Questions

What are exogenic and endogenic forces?

1. The forces that work on the surface of the earth are called exogenic forces.
2. The forces that act in the interior of the earth are called endogenic forces.


What is erosion?

Erosion is a process where natural forces like water, wind, ice, and gravity wear away rocks and soil. It is a geological process and part of the rock cycle.
Erosion occurs at the surface of the earth and does not affect the earth's mantle and core.


How are beaches formed?

Beaches are formed when the sea waves deposit sediments along the shores of the sea.


Very short answer type question  
What do you know about the lithospheric plates?

The earth's crust consists of several large and some small, rigid, irregularly-shaped plates. They are like slabs which carry continents and the ocean floor.


Very short answer type question 
What does the process of erosion and deposition create?

The process of erosion and deposition create different landforms on the surface of the earth.


Very short answer type question 
Where is Victoria Falls located?

Victoria Falls are located on the borders of Zambia and Zimbabwe in Africa.


Very short answer type question 
Define 'focus' point.

The place in the crust, underground where the movement/vibrations of the earthquake start is called the 'focus'. 


Give Reason
Buildings collapses due to earthquakes.

Most of the buildings are not safe enough to resist the vibration of the earthquakes. They are not made earthquake-proof. They collapse tearing apart due to shallow foundation and lack of adequate steel in the interior design.


Give Reason
Some rocks have a shape of a mushroom.

In deserts, winds usually erode the lower section of the rock more than the upper part. Therefore, such rocks have narrower base and wider top, which take the shape of mushroom.


Give Reason
Flood plains are very fertile.

Flood plains are formed by the deposition of fine soil and other material called sediments on the river banks. As the soil and sediments are brought by flood water, they are very fertile.


Give Reason
Sea caves are turned into stacks.

Sea waves strike at the rocks. As a result cracks develop which become bigger over time and hollow like caves are formed on the rocks. They are called sea caves. These cavities become bigger and bigger and a time comes when only roof of the caves remain to form sea arches. Further erosion breaks the roof and only walls are left. These wall like features are called stacks. In this way, sea caves are turned into stacks.


Very short answer type question 
Name the two processes which wear away the landscape.

Weathering and erosion.


Class 7 Geography Extra Questions