The correct answers are:
- It is a terrestrial planet;
The Earth is a terrestrial plant, and the main reason why it is classified as such is because it has a hard, rocky shell. The terrestrial planets seem to form closer to the Sun, or rather the star, while the gas planets further away from it.
- It has formed from gas and dust;
The most accepted theory about the formation of the Earth is that it formed from heated gas and dust, otherwise known as nebula. Under the gravity the material collapsed on itself, the particles started to merge with one another, and over time they became a large body, which under the influence of the spinning in a roughly circular manner, got the rounded shape.
Greeks because the first Olympic Games took place in Olympia, Greece.
Speed in a given direction is called velocity.
This is false.
This might be true in the case of solar energy (if there is not enough sun, there won't be a lot of energy that can be obtained from it), but it's less true in the case of for example hydraulic energy - most rivers flow both in good and bad weather (except if the bad weather is drought).
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