while hiking in the grand canyon of northern arizona, you stop and observe an outcrop that exposes three different sedimentary rock types. on the bottom is a layer of shale, which is overlain by a layer of limestone, which is in turn overlain by a layer of sandstone. this stratigraphic sequence indicates a or a in sea-level occurred in this location in the past.

Why does sweden and norway have steep roofs

Concealer circle oh in which arc xy measures 16 pi centimeters the length of the radius of the circle is 32 cm what is the circumference of the circle

Some gamma ray bursts are hypothesized to come from mergers of neutron stars or black holes. if this hypothesis is correct, what else should we in principle be able to detect from such mergers? a. gravitiational waves b. x-ray bursts c. significant disruption of gas thousands of light-years away in the surrounding galaxy d. an "afterglow" of bright visible light, lasting for weeks