Left, had trekked, has visted, couldn't, bigger
Answer: The answer is B. The man builds a fire beneath a tree without realizing it's heavy with snow.
Explanation: I took the quiz on K12, and got this question right. Good luck!
The verb of the sentence is "gazed", the subject of the sentence is the mountain.
Nuclear energy produces radioactive waste
A major environmental concern related to nuclear power is the creation of radioactive wastes such as uranium mill tailings, spent (used) reactor fuel, and other radioactive wastes. These materials can remain radioactive and dangerous to human health for thousands of years.
