First of all, in the Appalachians and Himalayas there is differences and similarities between the Appalachian and the Himalayas physical features,in the passage it states that the Appalachians have black diamonds but in the Himalayas it does not state that,and it also states that They have different mountains such as the Appalachians has Mt.mitchell and the Himalayas has Mt.Everest But,they both have rivers or streams and valleys and