It is hydropower the first option
The correct options are:
- Improved engines; engines were improved significantly so that they can have the same power and agility but by using less fuel.
- Cleaner burning fuels; it has been invested a lot of time and money into improving the fuels and making them as effective as possible but also removing or lowering the most dangerous components towards the environment.
- Catalytic converters; this devices for exhaust emission control manage to convert the toxic gasses and polutants into less toxic pollutants by managing to catalyze a redox reaction.
Political map would be your best option to show which countries are part of the African nations.
The plate-driving force is the slow movement of hot, softened mantle that lies below the rigid plates."
It's the mantle.
India’s doubling time is 42 years
