The Ghats mountains are a positive geographic influence and the Himalayas a negative geographic influence for settlement because:
The Himalayas are subjected to fierce storms frequently. Since it houses one of the highest peaks in the world, it is completely covered with ice and snow. Beneath the Himalayas the earth tends to move, eventually leading to a rise in the height of the mountains at the cost of earthquakes.
Meanwhile, the Eastern Ghats and the Western Ghats are not subjected to such extreme situations thus making it a positive influence for settlement, despite the landslides which happen frequently.