You find a beaker filled with an unknown clear liquid on your lab bench. what should you do?

Plz plz plz quick! 49 points for whoever which of the following statements about greenhouse effect is true? *life on earth is suffering because of greenhouse effect *the greenhouse effect is caused by human activity *all greenhouse gases are harmful *life on earth would not exist without the greenhouse effect

The buildup of sediments where a river empties into a slow-moving or nonmoving body of water is known as a/an

Which of the following types of stars are dim but can have high surface temperatures? giants main sequence stars supergiants dwarfs