EAS 201 - 6 - The Science of Natural Disasters Natural...

Info iconThis preview shows pages 1–3. Sign up to view the full content.

View Full Document Right Arrow Icon
The Science of Natural Disasters Natural Disasters , 7th ed., by Patrick L. Abbott (New York: McGraw-Hill, 2009; ISBN-13: 978-0-07-337669-1). Written Assignment 6 Short Answer Questions Answer the following questions as completely as possible. 1. Explain the laws of superposition, faunal assemblages and faunal succession. How do they support the theory of evolution? [LO6.1] Laws of superposition; A concept initially proposed by Avicenna, a Persian geologist in the 11 th century, then clarified by a Danish scientist Nicolas Steno in 1669. Whereby explaining sedimentary layering(strata). Starting with the older sedimentary layers on the bottom of rocks on surfaces, mounting vertically as layered with newer or younger sediment creating more strata. The law assumes that all strata or layers once included liquid that sinks to the bottom of the layers. Over time these layers accumulate and change based on the environment. The changes in strata bond creating a separation between the layers. The assemblages of fossils, also known as faunal assemblages, can be recognized through intervals of sedimentary strata. Faunal assemblages; Used to chronologically correlate fossils to time periods in history. Each strata contains faunal assemblage, each biozone contains geological strata. In that stratum contains the fossils unique to that area. As organisms die or go extinct their fossils are encapsulated in the sedimentary rock of that time period. In 1815, W. Smith published a book of geological maps of England and
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Wales using the principles of faunal assemblages. Sparking a scientific movement to categorize and study faunal assemblage, stratum and world history. Faunal successions; When older forms of organisms die off, new forms emerge, developing new life, known as the fauna succession, lending support to the theory of evolution. As stratum is analyzed on the lower levels, we can see fossilize dinosaur bones, while on successive levels we see Neanderthal bones. Indicating the two where during different time periods. Studying the succession allows geologists and paleontologists to study history and time periods in our evolution. 2. List the mechanisms by which mass extinctions occur. Which do you
Background image of page 2
Image of page 3
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 09/29/2010 for the course EAS EAS 201 taught by Professor Pearce during the Summer '10 term at Thomas Edison State.

Page1 / 7

EAS 201 - 6 - The Science of Natural Disasters Natural...

This preview shows document pages 1 - 3. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online