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Edit View History Bookmarks People Window Help 7296 Sun 7:30 PM D Blo101NOnlinesylsp2 Grades x G Take Test: Unit 1 Exam x Mail blake2hacmich edu x Secure https://blackboard.cmich.edu/webappsassessment/take/launch.isp?course assessment ida 182484 1&course; ida 128390 1&content; ida QUESTION 21 25 points save Answer What is the correct order of land mass formation starting with the oldest and moving towards the most recent? Pangea, Gondwana, Earth's crust Earth's crust, Pangea, Gondwana Earth's crust, Gondwana, Pangea Gondwana, Earth's crust, Pangea Pangea, Earth's crust. Gondwana 2.5 points Save Answer QUESTION 22 An unusual, worldwide formation of sedimentary rock called the K-Pg boundary sequence contains rare elements that are associated with alv volcanic eruption worldwide flood Ice Age O asteroid impact O large earthquake 25 points Save Answer QUESTION 23 regions he would Darwin inspired by ideas on the geologic history of Earth, which allowed him to better understand the geology of the visit on his journey aboard the Beagle

Explanation / Answer

21) option 3

The average age of the current Earth's continental crust has been estimated to be about 2.0 billion years. Most crustal rocks formed before 2.5 billion years ago are located in cratons. Such old continental crust and the underlying mantle asthenosphere are less dense than elsewhere in Earth and so are not readily destroyed by subduction. Formation of new continental crust is linked to periods of intense orogeny; these periods coincide with the formation of the supercontinents such as Rodinia, Pangaea and Gondwana. The crust forms in part by aggregation of island arcs including granite and metamorphic fold belts, and it is preserved in part by depletion of the underlying mantle to form buoyant lithospheric mantle.

Pangaea or Pangea (pronunciation: /pændi/) was a supercontinent that existed during the late Paleozoic and early Mesozoic eras. It assembled from earlier continental units approximately 335 million years ago, and it began to break apart about 175 million years ago.

Around 335 to 250 million years ago Gondwana and Laurasia joined together to form the supercontinent Pangaea, which existed until approximately 215 to 175 million years ago. Gondwana then separated from Laurasia (the mid-Mesozoic era) in the breakup of Pangaea, drifting farther south after the split. Gondwana itself then also broke apart.

22) aestroid impact

23) option 1

Darwin's early interest in nature led him to neglect his medical education at the University of Edinburgh; instead, he helped to investigate marine invertebrates. Studies at the University of Cambridge (Christ's College) encouraged his passion for natural science. His five-year voyage on HMS Beagle established him as an eminent geologist whose observations and theories supported Charles Lyell's uniformitarian ideas, and publication of his journal of the voyage made him famous as a popular author.

24) option 2

Mitochondrial DNA (mtDNA or mDNA)is the DNA located in mitochondria, cellular organelles within eukaryotic cells that convert chemical energy from food into a form that cells can use, adenosine triphosphate (ATP). Mitochondrial DNA is only a small portion of the DNA in a eukaryotic cell; most of the DNA can be found in the cell nucleus and, in plants and algae, also in plastids such as chloroplasts.

In humans, the 16,569 base pairs of mitochondrial DNA encode for only 37 genes.Human mitochondrial DNA was the first significant part of the human genome to be sequenced. In most species, including humans, mtDNA is inherited solely from the mother.

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