Answer:
A) The outer planets consist mostly of gases .
Explanation:
Inner planet constitutes of the planets closest to the sun , i.e. , Mars , Earth , Venus , Mercury .
Outer planet constitutes of the planets farthest from the sun , i.e. , Neptune , Uranus , Saturn , Jupiter .
The inner planets of the Solar system are composed of metals and rocks and hence are of solid state and heavy .
Whereas , the outer planets are composed of mainly gases like hydrogen and helium and hence are light in weight .
Answer:
Though there is no lake or river flowing through Sam's region,
Explanation:
Environmental quality refers to the features and the properties which are ideal for a good environment. The characteristics may be either in a generalized tone or in the local aspect. These characteristics help in maintaining the life of living organisms. The quality of air, water, and sound can be stated under the features of environmental quality.
In the given passage, the quality of air in Sam's region meets good environmental quality. On the other hand, the region does not have any lake or river. Since any water body is absent, therefore, the given sentence depicts the poor environmental quality.
The African continent isn't suffering from the environmental challenge "reforestation", since most of the continent hasn't suffered deforestation.
Answer:
<u><em>Gravity </em></u>
Explanation:
Basically, the sun keeps all the planets in the orbital motion by gravitational alignment. Just as the earth and moon have a similar gravitational pull towards each other. Galileo gave the idea of Copernicus theory. The theory also follows the models of the geocentric model of Ptolemy. Stars are at a fixed position from the sun and far away from the sun. As compared to the earth which is nearby and rotates on its axis from right to left.
