Whats most difficult to understand about particles

Which of the following energy sources is not an example of renewable energy? a. a wind turbine farm b. a clean-burning, coal-fired electric plant c. a hydroelectric dam d. a solar panel mounted on a home

The lines marked by the letters a, b, and c on the map above represent a. chains of volcanoes b. earthquake fault lines c. thin strips of heavy forests d. major rivers that flow from north to south

Migrant workers who fill employment needs in their host country often send remittances to their home countries