The aroura borealis, also called the northern lights, is a natural phenomenon that creates bright dancing lights in the night sky that is vewible in both north and south hemispheres (In the southern hemisphere, the phenomenon is called Aurora australis). the colourful lightshow is the result of collisions between gaseous particles in the Earth's atmosphere with charged particles released from the sun's atmosphere, usually caused by the suns solar flare and its interaction with earths magnetic field. the best time to veiw the Aroura Borealis is on a clear dark night, usually between the months of April and August, as most days during the summer arent very cloudy and provides a clear view of the night sky. pinpointing one place to view it is hard, but the closer you are to the earths poles, the better the visibility, as the most interaction between the flares and magnetic field occour at Earths poles

Classify the following soils according to the uscs classification system. provide appropriate uscs designations. a) this sample of well-graded gravel with sand was obtained from a large earthen dam in vancouver, canada. the sample has 73% fine to coarse sub-angular gravel, 25% fine to coarse sub-angular sand and 2% fines. the maximum size of the particles is 75 mm. the coefficient of curvature is 2.7, while the uniformity coefficient is 12.4. b) this dark brown and wet soil with a “strong organic odor” has 100% passing the no. 200 sieve. the liquid limit of the material is 32% when not dried and is 21% when oven-dried. the plastic index is 21% when not dried. c) this sand has 61% predominantly fine sand, 23% silty fines, and 16% fine sub-rounded gravel size. the maximum size is 20 mm. the liquid limit is 33% and the plastic limit is 27%. d) this soil has 74% fine to coarse sub-angular reddish sand and 26% organic and silty dark brown fines. the liquid limit is 37% when not dried and is 26% when oven dried. the plastic index is 6% when not dried.

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Frank just graduated from eighth grade. assuming exactly four years from now he will graduate from high school how many seconds does he have until his high school graduation