Solar panels are expensive, they are kept this way by the companies.
The price ranges around $10.000 - $15.000 for an installation. It takes years to get this investment back and in the meantime the batteries need to be changed and power converter need to be maintenance, etc.
your answer is 4. sufficient sunlight reaches only a few locations
Europe is not a typically dry place (unlike for exampe Mesopotamia) so it does not need rivers for irrigation.
Instead, rivers are needed more for transport - they have served as a means of communication and for the exchange of goods.
For example, Danube allowed a big-scale trade between the cities lying on it: Vienna, Budapest and Bratislava.
Answer:
The Earth orbit around the Sun is an ellipse.
Explanation:
Earth, like all other planets in the solar system, orbits are the only star in it, the Sun. Each planet's orbit is unique and has its own specific characteristics, but one that seems to be shared by all is that they all have an orbit that is an ellipse, Earth included.
Such an orbit means that Earth is not constantly at the same distance from the Sun. In one part of the orbit, Earth is closer to the Sun, while in another part of the orbit it is further away from the Sun. The point where Earth is the closest to the Sun is called perihelion and this is when Earth orbits the fastest because it experiences more of the gravitational pull by the Sun. The point where Earth is the furthest away from the Sun is called aphelion and this is when Earth orbits the slowest because it experiences the least of the gravitational pull by the Sun.
Answer:
teach visitors to recycle
Explanation:
