How old is Earth approximately?

Earth is approximately 4600 million years old.

What are the three main geological divisions of India?
A) Himalayas, Plains, Deserts
B) Peninsular Block, Himalayas, Indo-Ganga-Brahmaputra Plain
C) Mountains, Plateaus, Coasts
D) North, Central, South

B) Peninsular Block, Himalayas, Indo-Ganga-Brahmaputra Plain

True or False: The Indian plate is still moving northward today.

True.
 The northward movement of the Indian plate continues and significantly affects the Indian subcontinent's physical environment.

The Peninsular Block consists of very ancient _____ and _____.

Gneisses and granites

Which mountain ranges separate the Indian subcontinent from Central and East Asian countries?

The Himalayas act as a barrier separating India from Central and East Asian countries.

What type of geological structure characterizes the Himalayas compared to the Peninsular Block?

The Himalayas are young, weak, and flexible, contrasting with the rigid and stable Peninsular Block.

Riddle: I am a narrow belt where mountain streams deposit rocks and rivers disappear. What am I?

Bhabar zone

What is the average depth of alluvial deposits in Indo-Ganga-Brahmaputra plains?
A) 500-800 meters
B) 1,000-2,000 meters
C) 2,500-3,000 meters
D) 100-500 meters

B) 1,000-2,000 meters

True or False: The Great Himalayan Range runs exactly 2,500 km from east to west.

True. 
The Great Himalayan Range is approximately 2,500 km long from east to west.

In which region do the Himalayan ranges run in a north-south direction?

In Nagaland, Manipur, and Mizoram, the ranges run in a north-south direction.

What creates the marshy areas with rich vegetation south of Bhabar?

The Tarai zone, where streams re-emerge, creates marshy areas with rich natural vegetation and wildlife.

Which plateau is subdivided into Garo Hills, Khasi Hills, and Jaintia Hills?

The Meghalaya Plateau is subdivided into Garo Hills, Khasi Hills, and Jaintia Hills.

The Great Indian Desert is also known as _____.

Marusthali

What geological evidence suggests the Indian Desert was once underwater?
A) Sand dunes
B) Marine deposits and wood fossils
C) Salt lakes
D) Underground rivers

B) Marine deposits and wood fossils (approximately 180 million years old found at Aakal Fossil Park)

True or False: The Western Coastal Plains are broader than the Eastern Coastal Plains.

False. 
The Eastern Coastal Plains are broader than the Western Coastal Plains.

Why do rivers on the Western Coastal Plains not form deltas?

The western coast is narrow and represents a submerged coastline, preventing delta formation.

What are the crescent-shaped sand dunes in the desert called?

Barchans are the crescent-shaped sand dunes found in the desert region.

Which rivers form the major deltas on the Eastern Coastal Plains?
A) Narmada, Tapi, Mahanadi
B) Indus, Ganga, Brahmaputra
C) Mahanadi, Godavari, Krishna, Kaveri
D) Yamuna, Chambal, Banas

C) Mahanadi, Godavari, Krishna, Kaveri form major deltas on the Eastern Coastal Plains.

What type of landforms characterize young Himalayan rivers in their youthful stage?

Gorges, V-shaped valleys, rapids, and waterfalls characterize young Himalayan rivers in their youthful stage.

The famous Nehru Trophy Vallamkali boat race occurs in _____ Kayal, Kerala.

Punnamada