A.) On the Volcanic Ash Thickness Map, points of measured ash thickness (in centimeters) are shown on the map. To complete the isopach map, draw lines of thickness contours (lines) for the following 8 depths of ash. 1, 5, 10, 20, 25, 30, 40 and 50.

b.) What is the approximate width of the >1 cm ash blanket?
Please help. Will mark brainliest.

No is the answer to the question

Ithink it's the third answer

Large asteroid and comet impacts. because they can have a huge impact on the environment, such as a loss of land, and crust on the earth with the big holes they produce. on the other hand, volcanic eruptions can also cause change within the environment by producing land, but im actually not quite sure which one would be a better answer, hopefully you read this and didnt just flat out choose the first sentence i have spoken! your welcome~