A democracy can have both representative and direct characterisies at the same time

Yes because many states in the Middle and Western US are democracies consisting of both elements. On the one hand, they have Legislatures made up of Representatives and Senators - this is, of course, representative democracy since the officials are elected and then go on to represent their electors in the Legislature. Additionally, many of these states have the initiative and referendum process.

australian plates collided into eurasian plates, and the himalayas formed. the andes mountain range the himalayas and the islands of japan form differently. the andes mountain range formed at the convergent boundary of an oceanic plate and continental plate.