Is the united states a developing country or a developed country? how can you tell?

In what way does renewable energy differ form nonrenewable energy?

Sink holes may eventually for to join a. wide valleys b. zone of aeration c. dripstones d. aquifer

With these question would be nice i needs them in a hurry which nation leads eastern europe in nuclear energy usage? a ukraine b lithuania c slovakia d solvenia which eastern european nation is popular with skiers? a czech republic b estonia c bulgaria d none are