Mountain groups are clusters of mountains that share similar geological features, climate, and ecosystems. They often form as a result of tectonic activity, where the Earth's plates collide or pull apart. Examples of mountain groups include the Rocky Mountains in North America and the Himalayas in Asia, which are known for their impressive peaks and diverse wildlife. These mountain groups can vary in size and shape, ranging from small hills to vast ranges. They play a crucial role in influencing local weather patterns and providing habitats for various species. Additionally, mountain groups are popular destinations for outdoor activities like hiking, skiing, and climbing.