**The Size of the Amazon Basin**

The Amazon basin is indeed bigger than the Ganga Brahmaputra basin due to several geographical factors. Let's delve into the details:

**1. Area**

The Amazon basin covers a vast area of approximately 7 million square kilometers, making it the largest river basin in the world. On the other hand, the Ganga Brahmaputra basin spans around 1.7 million square kilometers, which is significantly smaller in comparison.

**2. River Length**

The Amazon River, flowing through the Amazon basin, is the second longest river in the world, stretching over 6,400 kilometers. It originates from the Peruvian Andes and discharges into the Atlantic Ocean. In contrast, the Ganga Brahmaputra River system is about 2,900 kilometers long, originating from the Himalayas and merging into the Bay of Bengal.

**3. Rainfall and Tributaries**

The Amazon basin receives copious amounts of rainfall throughout the year, which contributes to its large size. The region experiences a tropical rainforest climate, resulting in heavy precipitation. Moreover, the Amazon basin is fed by numerous tributaries, including major ones like the Negro, Madeira, and Purus rivers. These tributaries increase the water flow, contributing to the expansion of the basin.

On the other hand, the Ganga Brahmaputra basin receives rainfall predominantly during the monsoon season, which lasts for a few months. While it does have its share of tributaries, such as the Yamuna and Brahmaputra rivers, they are not as extensive or numerous as those in the Amazon basin.

**4. Topography and Terrain**

The topography and terrain of the Amazon basin play a crucial role in its size. The basin is characterized by vast low-lying plains, allowing the river and its tributaries to spread out and form an extensive network. In contrast, the Ganga Brahmaputra basin has a more varied topography, with mountainous regions, plateaus, and floodplains. These features restrict the expansion of the basin to a certain extent.

**Life in the Amazon Basin**

The Amazon basin is home to one of the most diverse ecosystems on Earth, known as the Amazon Rainforest. This region boasts an incredible array of plant and animal species, many of which are found nowhere else in the world. It supports a complex web of life, including jaguars, anacondas, macaws, and countless other species.

Indigenous communities have also inhabited the Amazon basin for centuries, relying on the forest for their livelihoods. They practice sustainable lifestyles, utilizing the rich resources while maintaining a balance with nature. However, the Amazon basin is under threat due to deforestation, illegal logging, and industrial activities. Efforts are being made to protect this unique ecosystem and the indigenous communities that call it home.

In conclusion, the Amazon basin is larger than the Ganga Brahmaputra basin due to its extensive area, longer river length, abundant rainfall, numerous tributaries, and favorable topography. The Amazon basin supports a rich and diverse ecosystem, but it faces significant challenges in terms of conservation and sustainability.

I) The soil of ganga brahmaputra basin is very fertile and suitable for cultivation of crops.

ii) Agriculture is the major reason for the dense population of ganga brahmaputra basin which is a source of livehood.

iii) Amazon basin has thick and wild forest which make them unsuitable for living.