Environmental Studies

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The acidity levels of the early oceans were much lower than today, so it took 4 billion years of ... Started by nevelica	1 Replies 103 Views	Jul 15, 2018 by enass
Pluto has been downgraded to the status of a protoplanet. Indicate whether this statement is true ... Started by fox	3 Replies 75 Views	Jul 15, 2018 by kmb352
Dinosaurs and large mammals coexisted during the Mesozoic era. Indicate whether this statement is ... Started by stevenposner	1 Replies 64 Views	Jul 15, 2018 by CAPTAINAMERICA
How old is the oldest known mineral, a zircon crystal, on Earth? A) 13.7 billion years old B) ... Started by gbarreiro	1 Replies 76 Views	Jul 15, 2018 by Joc
What was the name of the supercontinent that formed approximately 1.1 billion years ago? A) ... Started by tfester	1 Replies 79 Views	Jul 15, 2018 by k2629
The ________ of a continent consists of Precambrian rocks of the craton covered by a thin mantle of ... Started by yoroshambo	1 Replies 66 Views	Jul 15, 2018 by carolinefletcherr
The oldest known terrestrial material (a zircon included in a younger rock) dates back to 4.4 ... Started by K@	1 Replies 89 Views	Jul 15, 2018 by orangecrush
A(n) ________ is a period when a supercontinent rifts into fragments, spreads apart, and the ... Started by lindiwe	1 Replies 95 Views	Jul 15, 2018 by katheyjon
The Navajo Sandstone, such as that exposed at Zion National Park in Utah, is evidence of a ________ ... Started by scienceeasy	1 Replies 137 Views	Jul 15, 2018 by mk6555
What era, period, and epoch do we currently exist in? A) Precambrian, Jurassic, Eocene B) ... Started by fox	3 Replies 78 Views	Jul 15, 2018 by C.mcnichol98
During which period did the break-up of Pangaea begin? A) Permian B) Tertiary C) Triassic D) ... Started by c0205847	1 Replies 65 Views	Jul 15, 2018 by mmpiza
The ________ Period was called the golden age of trilobites, resulting in more than 600 genera of ... Started by drink	1 Replies 199 Views	Jul 15, 2018 by stillxalice
How old are the oldest fossils of more advanced organisms, the eukaryotes? A) 3.8 billion years ... Started by DyllonKazuo	1 Replies 77 Views	Jul 15, 2018 by underwood14
In what geologic period did lobe-finned fish adapt to terrestrial environments? A) Cambrian B) ... Started by mpobi80	1 Replies 106 Views	Jul 15, 2018 by coreycathey
The dominant plant group during the Mesozoic Era was ________. A) exosperms B) methanogens C) ... Started by neverstopbelieb	1 Replies 41 Views	Jul 15, 2018 by orangecrush
Why did invertebrates, particularly arthropods, get so large in the Late Paleozoic? A) There was ... Started by brutforce	1 Replies 114 Views	Jul 15, 2018 by aburgess
Which of Earth's major extinctions was the most extensive, eliminating 70 percent of all terrestrial ... Started by cagreen833	1 Replies 66 Views	Jul 15, 2018 by Shshxj
Which group of animals will bear live young that are underdeveloped and must stay in the mother's ... Started by Ebrown	3 Replies 69 Views	Jul 15, 2018 by Chocorrol77
Which of the following is a modern descendant of the gymnosperm plants of the Mesozoic? A) ... Started by vicotolentino	1 Replies 186 Views	Jul 15, 2018 by janeli1
Flying reptiles such as the Archaeopteryx led to the evolution of ________. A) dinosaurs B) ... Started by jCorn1234	1 Replies 59 Views	Jul 15, 2018 by Jsherida
The early Earth was not hospitable to life as we know it because of meteorite bombardment, an ... Started by serike	1 Replies 75 Views	Jul 15, 2018 by hanadaa
How does the process and rate seafloor spreading affect sea level? What will be an ideal ... Started by erika	1 Replies 44 Views	Jul 15, 2018 by shewald78
Mammals did not evolve until the beginning of the Cenozoic and then did so to fill an evolutionary ... Started by tth	1 Replies 118 Views	Jul 15, 2018 by peilian
Compare and contrast reptiles and mammals. Why were mammals able to occupy more diverse habitats ... Started by ENagel	1 Replies 326 Views	Jul 15, 2018 by beccamahon
Why is the molten metallic core of Earth necessary for life to exist? What will be an ideal ... Started by melly21297	1 Replies 184 Views	Jul 15, 2018 by cadimas