I think the answer is the "Caloris Basin".
Mercury is known for its dimbiness
Mercury is known for its dimbiness
Merury most well-known feature is The Caloris Basin.
The weight of an object that is 100 pounds on Earth would be approximately 38 pounds on Mercury. This is because Mercury's gravity is about 38% that of Earth's, so the object would weigh less on Mercury.
It depends what the object is.
If an object floats in water it will also float in the much denser mercury
Mercury itself is very poisonous. It collects in meat and tissue, as well, so mercury can carry over from anything that has consumed it. Fish are known for leading to mercury poisoning.
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No spacecraft was needed in order to discover the planet Mercury. It's a "naked eye" object, and has been known as a morning-star/evening-star since ancient times.
Yes
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Mercury's most well known feature is that it is a metal at room temperature. Mercury is the only metal to have this property (though some metals melt slightly above room temperature). In fact, mercury is one of only two elements (the other being bromine) that are liquid at room temp.