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I am a high school student, my question is about the collision between the Indian Plate and the Eurasian Plate. When this happens what happens to the area of the Asian continent. Does it increase or decrease? Also, south Asia gets Monsoon rains, is this an effect of this collision?

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As the continental crust is too buoyant (light) to be subducted, when two continents collide they smash against each other creating a mountain range, in this case the Himalayas. This process happen trough thrusting and folding of the plates, leading to something called lithospheric shortening. Which basically means that the plates (lithosphere is the stuff of which plates are made of) gets shorter. In other words: the area of the colliding continents gets smaller. And the missing area is used to build up the mountains by thrusting and folding, a process that is nicely illustrated by the following animated GIF that I put together from a video by the Department of Earth Sciences of UC Santa Barbara.

enter image description here

In this question, this process is also discussed.

In regard of the Monsoon, it is not a direct consequence of this collision. But it is due to the fact that Eurasia is a big continent close to the equatorial Indian ocean. Now, as this collision helped to put together Eurasia and bring it closer to the equatorial Indian ocean in the area associated with the Monsoon, you can argue that played a significant role in creating the Monsoons as we know them.

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