Answer:
The presence in the air of one or more contaminants in such a concentration and of such duration as to cause a nuisance or to be injurious to human life, animal life or vegetation.
The flags that were placed by people who landed there
Answer:
Hornfels
Explanation:
Hornfels -
It refers to the category of metamorphic rocks that are heated and hardened by the igneous masses , is referred to as hornfels .
They are finely grained metamorphic rocks .
The temperature required for the formation of these rocks is about 1300 to 1450 degrees Fahrenheit .
These rocks are formed near lava flow , sill etc.
Hence , from the given information of the question ,
The correct answer is hornfels .
