Study this image of a geologic time scale. A 4 column table. Column 1, titled ERA, with entries: Caenozoic, Mesozoic, Paleazoic, Proterozoic, Archean, Hadean. Column 2, titled PERIOD, with entries: Quaternary, Tertiary, Cretaceous, Jurassic, Triassic, Permian, Carboniferous, Devonian, Silurian, Ordovician, Cambrian, Also known as Precambrian. Column 3, titled MILLIONS OF YEARS AGO, with entries: 1.6, 138, 240, 330, 410, 500, 3500. Column 4, titled KEY EVENTS, with entries: Humans evolve, Extinction of Dinosaurs with arrow pointing to approximately 68 M Y A; Permian mass extinction with arrow pointing just below 240 M Y A; Invertebrates become common with arrow pointing just below 500 M Y A; Earliest life with arrow pointing to 3500 M Y A. How long ago did invertebrates become common on Earth?

sea breeze

explanation:

cool air is going towards land allowing for the land to be cooler, the hotter air gets pushed away from the land.

easy

explanation:

oxygen is the first element in group 16 (via) of the periodic table. the periodic table is a chart that shows how chemical elements are related to each other. the elements in group 16 are said to belong to the chalcogen family. other elements in this group include  sulfur, selenium, tellurium,  and  polonium.  the name chalcogen comes from the greek word  chalkos,  meaning "ore." the first two members of the family, oxygen and sulfur, are found in most ores.

oxygen is by far the most abundant element in the earth's crust. nearly half of all the atoms in the earth are oxygen atoms. oxygen also makes up about one-fifth of the earth's atmosphere. nearly 90 percent of the weight of the oceans is due to oxygen. in addition, oxygen is thought to be the third most abundant element in the universe and in the solar system.