Earth’s atmosphere is a mixture of nitrogen (79%), oxygen (20%), and a small fraction of carbon dioxide, water vapours and other gases. This makes the existence of life possible on Earth. However, the atmospheres on Venus and Mars mainly consist of carbon dioxide. The amount of carbon dioxide on these planets can range from 95% to 97%. This may be the reason no life exists on these planets.
The atmosphere of Venus is about 96 per cent carbon dioxide, with surface temperatures around 737 K (464 °C, or 867 °F).
Venus itself rotates only once every 243 Earth days.
Mars, in contrast, has a thin atmosphere composed of about 95 per cent carbon dioxide, with the remainder being mostly diatomic nitrogen.
Answer:
Fields should be bigger to feed more people, but they are smaller because people live on those lands.
Explanation:
A higher population density means that there are more people in an area. As there are more people, there is not enough space for all of them to live in the city, so new cities and towns emerge occupying the field's lands used for cattle raising and agriculture. There should be larger fields to feed all the population, but they become smaller because parts of them are now populated.
The following characteristic is not what geologists use to identify minerals a. softness
Answer:
An effect of the Peloponnese war was that Macedonia invaded Greece.
Explanation:
The Peloponnese war was a war between Sparta and Athens, with Sparta coming out as a victor in it. The lack of political absence of Athens for some time in the region because of the engagement in the war with Sparta gave opportunity the Macedonians to be able to speed up their progress, implement reforms, and rapidly become a force to be reckoned with.
The Macedonians managed to reform their army and strengthen their economy, and for the Hellenic city-states, this was not a good sign. Phillip II of Macedon attacked the Hellenic city-states and defeated them all, causing a huge loss in military personnel. One city-state that saved itself was Sparta, and there are two reasons for it, one is that they were in good relations with the Macedonians and often allied, and the other because it was of interest to any of the two sides to go in war against each other and suffer losses unnecesarilly.
