Which process causes hillsides and mountains to gradually get smaller?

Directions conduct research to collect information and data in order to write a well-informed argument essay responding to the following prompt: do you believe your local power company is doing enough to reduce dependence on nonrenewable energy sources? why or why not? remember that your argument essay should contain: a claim supporting evidence connected to your claim an acknowledgement of counterclaim(s) a conclusion after writing your rough draft, reread it and edit it for spelling, grammar, and clarity.

Avast plain of rolling hills are actually folds of monoclines domes and basins anticlines and synclines horsts and grabens

What is limestone i just need to know