Regions of continents that have not been subjected to orogeny during the past one billion years are termed ) exotic terranes b) accreted terranes c) cratons d) orogen

Cratons

Explanation:

Craton is the stable portion on the continental crust which are made up of basement rocks, it is the term used to differentiate the stable part on the continental crust from parts which are unstable or geologically active.

•Note: The term being "stable" means they have not undergone the process of orogenesis or orogeny.

Cratons can be located in the interior part of the continental crust, for example the west African craton, they are rich in crystal basement or felsic igneous rock, the most common example of such rock is granite

heat released by collision processes during accretion, and heat from decay of radioactive elements

explanation: