What is titan? why are scientists interested in it?

Titan is the largest moon of Saturn and second largest moon of solar system after Ganymede ( moon of Jupiter). Titan is even bigger than planet Mercury.

Scientists are interested in studying it because Titan holds the possibility of life on it.

Though, it does not have water but there is possible pre-biotic environment and may be biotic environment in the sub surface. The atmosphere of titan is mainly composed of nitrogen and is very dense with traces o hydrocarbons. The surface of titan is liquid hydrocarbons lakes. It has weather pattern similar to Earth's. Also, it has methane cycle just like water cycle on Earth.

the answer to your question is c.

if you read the house of usher you should know that the house was haunted

in chemistry, adhesion and cohesion are attractive forces that exist between molecules. they hold the molecules together from each other. they are different in that adhesive force exists between molecules of different substance while cohesive force happens between molecules of same substance.

adhesion between water and glass causes water molecules at the edge of water and glass interface to climb up the wall in a narrow glass tube. this is called capillary action. cohesion is what gives glass its shape and causes water to form a droplet.