Answer: The knowledge of solar system has increased in past few years among people because of the reasons such as-
- People make assumption about the planet we live in and giving thought about other planets as well in the solar system and thus the exploration procedure starts .
- Exploration also includes the process of confirming whether the assumption made are correct or not and this factor leads to the measurement of the parameters that are in the assumption.
- If the assumption is false, corrections are made accordingly and if the assumption is correct then it is given a form of a theory which help people to understand the solar system better .
- These theories give information to people about solar system thus, increasing the knowledge about solar system.
Answer :D. All off the above
Explanation: I know It works
The melting temperature of materials is affected by the pressure they are under. So when "rock" in the Earth's mantle experiences a decrease in confining pressure, not only does it expand, it's melting temperature drops. If the melting temperature of the material drops below the background (also known as the
in-situ
) temperature, then melting will occur and in this case magma will form.
'Climatic variations' and 'Human activities' can be regarded as the two main causes of desertification. removal of the natural vegetation cover（by taking too much fuel wood）, agricultural activities in the vulnerable ecosystems of arid and semi-arid areas, which are thus strained beyond their capacity.
