GK
WORLD GEOGRAPHY
|
Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
|
|
|
Stars
|
|
|
Comets
|
|
|
Planets
|
|
|
Meteors
|
Detailed explanation-1: -Comets are cosmic snowballs of frozen gases, rock, and dust that orbit the Sun. When frozen, they are the size of a small town. When a comet’s orbit brings it close to the Sun, it heats up and spews dust and gases into a giant glowing head larger than most planets.
Detailed explanation-2: -The coma is a cloud of gases that surrounds the nucleus of a comet. In some comets, a cloud of hydrogen gas surrounds the coma.
Detailed explanation-3: -A comet’s coma is the atmosphere of gas and dust around the nucleus of the comet. It can be hundreds of thousands of kilometers wide. The coma of a comet is made largely of water and dust. When a comet approaches the Sun, it warms up.
Detailed explanation-4: -Comets are mostly water ice. It could be that comets made regular water deliveries to Earth. It would take a lot of comets to fill the ocean! But comets could well have made a big contribution.