Answer:
D. Mars takes a longer time to orbit the Sun than Mercury
Explanation:
Mercury is closer to the Sun than Mars, therefore it has a smaller orbit. One year on Mercury is 88 Earth days and One year on Mars is 687 Earth days.
Answer:
Option D, Oil forms because of geologic heat and pressure and can be found around the world in varying amounts.
Explanation:
Oil existing beneath the earth surface is primarily due to the deposition of organic matter millions of years ago with in the deep earth crust.
This deposition was uneven. With the temperature and pressure, the organic matter converted into fossil fuel (oil, coal etc.)
Hence, option D is correct
Answer:
<u>I and Il only, crystallization in magma and dissolved in water</u>.
Explanation:
- Most of the minerals are formed due to the crystallization of lava or molten matter in due course of time when it slowly cools in contact with the land surface as in rapid cooling there is no time for the formation of crystals.
- Minerals are then formed from the evaporated of the solution a mix of substances dissolved in another. For example deposits of table salts.
- If the magma erupts to the surface and becomes a lava it tends to cool quickly and small crystals are formed. Depending upon the number of gases and chemical composition of lava.
The northern semiarid steppe between the Sahara desert and the tropical grassland is called the Sahel.
Sahel, Arabic Sahil, extending east from Senegal to Sudan, semi-arid regions of West and North-Central Africa. It forms a transition zone between the dry Sahara (desert) in the north and the humid savanna zone in the south. The term "Sahel" is borrowed from the Arabic name for the region, al-sāḥil. Sāḥil literally means "coast.
The population of the Sahara Desert is only 2 million. The people of the Sahara are primarily nomadic and move from place to place according to the seasons. Others live in permanent communities near water sources.
Learn more about the Sahara desert at
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