GK
SOLAR SYSTEM
|
Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
|
|
|
a run-away greenhouse effect
|
|
|
liquid water on its surface
|
|
|
high surface gravity
|
|
|
an irregular planetary orbit
|
Detailed explanation-1: -Earth is the only inner planet in our solar system that has liquid water on its surface. Seventy percent of the surface is covered by oceans where photosynthesis takes place. This makes the ocean the principal life habitat on Earth.
Detailed explanation-2: -Earth’s size retains water, our atmospheric pressure keeps it on the surface.
Detailed explanation-3: -Liquid water is an essential requirement for life on Earth because it functions as a solvent. It is capable of dissolving substances and enabling key chemical reactions in animal, plant and microbial cells. Its chemical and physical properties allow it to dissolve more substances than most other liquids.
Detailed explanation-4: -Right distance from the Sun. Right temperature range. Presence of water. Presence of oxygen and hostile atmosphere. Presence of a blanket of ozone.