Physical Universe
16th Edition
ISBN: 9780077862619
Author: KRAUSKOPF, Konrad B. (konrad Bates), Beiser, Arthur
Publisher: Mcgraw-hill Education,
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Textbook Question
Chapter 16, Problem 31MC
The oxygen in the atmosphere
- a. was present since the earth was formed
- b. was emitted by volcanoes
- c. is the result of sunlight decomposing water vapor
- d. was produced by photosynthesis
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B. magma rising up from the mantle at a
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climate
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Chapter 16 Solutions
Physical Universe
Ch. 16 - A crack in the earths crust along which movement...Ch. 16 - A long, narrow bay with an irregular outline, such...Ch. 16 - The rugged character of mountain landscapes is...Ch. 16 - The ancient supercontinents Laurasia and Gondwana...Ch. 16 - A mountain range that was not once part of the...Ch. 16 - North America, Greenland, and most of Eurasia once...Ch. 16 - The shell of rigid rock that makes up the earths...Ch. 16 - Compared with the earths crust under the oceans,...Ch. 16 - Compared with the continents, the ocean floors are...Ch. 16 - The ocean floor near a midocean ridge a. has the...
Ch. 16 - According to the hypothesis of seafloor spreading,...Ch. 16 - The number of large plates into which the...Ch. 16 - In the course of 100 years, a lithospheric plate...Ch. 16 - A region where an edge of a lithospheric plate...Ch. 16 - Most volcanoes are found a. where continental...Ch. 16 - The Indian subcontinent a. was always part of Asia...Ch. 16 - Iceland was once a. a coral reef b. magma that...Ch. 16 - The San Andreas Fault in California is the result...Ch. 16 - If the processes of plate tectonics were to stop...Ch. 16 - The theory of evolution is supported by which one...Ch. 16 - An uneven surface on which a horizontal upper bed...Ch. 16 - Prob. 22MCCh. 16 - Prob. 23MCCh. 16 - Fossils are least likely to be found in a....Ch. 16 - Conditions for the preservation of fossils are...Ch. 16 - The division of geologic time into eras and...Ch. 16 - The earth was formed a. in 4004 B.C. b. about 2...Ch. 16 - Prob. 28MCCh. 16 - Precambrian rocks are a. never found b. extremely...Ch. 16 - Living things have been present on the earth a....Ch. 16 - The oxygen in the atmosphere a. was present since...Ch. 16 - Ancient geologic processes as revealed in...Ch. 16 - Coal is composed of a. petrified wood b. buried...Ch. 16 - A bed of coal usually implies that the region was...Ch. 16 - Prob. 35MCCh. 16 - Amphibians, fishes, and marine invertebrates were...Ch. 16 - The dinosaurs were which one or more of the...Ch. 16 - Dinosaurs were abundant in the a. Cenozoic b....Ch. 16 - Prob. 39MCCh. 16 - The leading explanation for the disappearance of...Ch. 16 - The ancestors of the birds were a. reptiles b....Ch. 16 - During the Cenozoic Era a. Laurasia and Gondwana...Ch. 16 - Pangaea broke up into Laurasia and Gondwana, which...Ch. 16 - The line of descent of humans broke away from that...Ch. 16 - The Cenozoic Era represents a period a. of almost...Ch. 16 - During the most recent ice age a. there was a...Ch. 16 - What landscape features are associated with...Ch. 16 - List all the evidence you can for each of the...Ch. 16 - What geologic process is chiefly responsible for...Ch. 16 - Deposits of igneous rocks are found intruded in...Ch. 16 - Why is it believed that the region where the Rocky...Ch. 16 - What kind of biological evidence supports the...Ch. 16 - The eastern coast of South America is a good fit...Ch. 16 - (a) Where was the Tethys Sea located? (b) Are...Ch. 16 - Which of todays continents were once part of...Ch. 16 - Which is denser, the granitic rock of the...Ch. 16 - (a) What is the difference between the earths...Ch. 16 - North America, Greenland, and Eurasia fit quite...Ch. 16 - How do the ages of the ocean floors compare with...Ch. 16 - When continental drift was proposed almost a...Ch. 16 - The energy source of erosional processes is the...Ch. 16 - Where do subduction zones occur? What happens at...Ch. 16 - The Himalayas are the highest mountain range on...Ch. 16 - How does the origin of the Himalayas differ from...Ch. 16 - Which are younger, the Rocky Mountains or the...Ch. 16 - Is the Atlantic Ocean becoming narrower or wider?...Ch. 16 - The San Andreas Fault in California is a...Ch. 16 - In what geological zones are most volcanoes found?Ch. 16 - Which plate collisions are responsible for...Ch. 16 - The distance between the continental shelves of...Ch. 16 - The oldest sediments found on the floor of the...Ch. 16 - In Fig. 16-47, beds A to F consist of sedimentary...Ch. 16 - (a) What is an unconformity? (b) If one is shown...Ch. 16 - What is a fault? If one is shown in Fig. 16-47,...Ch. 16 - What is the basis of the radiocarbon dating...Ch. 16 - The half-life of rubidium-87 is 47 billion years,...Ch. 16 - The half-life of potassium-40 is 1.3 billion...Ch. 16 - Why are fossils still useful in dating rock...Ch. 16 - List as many different kinds of fossils as you...Ch. 16 - Why are most fossils found in beds that were once...Ch. 16 - What is the basis for the division of geologic...Ch. 16 - What is the basis for the division of geologic...Ch. 16 - What is the oldest division of geologic time? In...Ch. 16 - During what divisions of geologic time have living...Ch. 16 - The earths history is sometimes divided into two...Ch. 16 - The early atmosphere of the earth probably...Ch. 16 - Precambrian rocks include sedimentary, igneous,...Ch. 16 - Precambrian rocks are exposed over a large part of...Ch. 16 - What conspicuous difference is there between...Ch. 16 - What are the chief kinds of organisms that have...Ch. 16 - Paleozoic sedimentary rocks derived from marine...Ch. 16 - Which of the following are found in Paleozoic rock...Ch. 16 - Why is it believed that large parts of the United...Ch. 16 - Under what circumstances is coal formed?Ch. 16 - What is believed to be the origin of petroleum? Of...Ch. 16 - What are some of the chief differences between...Ch. 16 - What kind of animals were the dinosaurs? Were they...Ch. 16 - What is believed to be the reason or reasons for...Ch. 16 - From what type of animal did birds evolve? 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- A rift valley is evidence of which kind of plate boundary? A. convergent B. divergent C. transform D. uniform O A O B Ос O Darrow_forwardReview. The North American and European plates of the Earths crust are drifting apart with a relative speed of about 25 mm/yr. Take the speed as constant and find when the rift between them started to open, to reach a current width of 2.9 103 mi.arrow_forward5. The "iceberg analogy" for the isostatic equilibrium of the continental crust turns out to be quite the relative density of icebergs versus seawater is close to the relative density of continental crust versus mantle. Glacial ice is about 15% less dense than seawater; likewise continental crust is about 15% less dense than the mantle. This leads to a simple rule that we can call the 1-to-8 rule: for every 1 unit of extra elevation for an iceberg or a mountain belt, there need to be 8 units of total thickness. These iceberg examples illustrate the idea: an iceberg 3 meters above sea level is 24 meters thick an iceberg 1 meter above sea level is 8 meters thick an iceberg 2 meters above sea level is 16 meters thick 3m 2m water level 1m >7m 14m 21m For the following questions, apply the 1-to-8 rule, assuming continental crust in isostatic equilibrium. a. Continental crust at sea level averages about 35 kilometers thick. (1 km = 0.6 miles.) Therefore, in general, how thick must the crust…arrow_forward
- réptilés d. all) of these 7. The development of ozóne in the stratosphere and oxygen in the atmosphere first made possible the development of a. complex organisms b. single-cell organisms c. cyanobacteria d. all of these 8. Today, many scientists think that a. 'birds evolved from dinosaurs b. dinosaurs evolved from reptiles c. birds evolved from amphibians d. both a andb 9. Ediacaran organisms first appeared during the a. Precambrian Time b. Cambrian Period c. Permian Period d. none of these 10. As a. cyanobacteria b. trilobites evolved, they changed Earth's atmosphere by producing oxygen. c. reptiles d. dinosaurs Geologic Timearrow_forwardWhich of the following STILL significantly heats the Earth's interior? a. bombardment b. compression c. radioactivity d. differentiationarrow_forward1. A giant ice sheet expands quickly over the surface of North America. For how long must the ice sheet remain in place in order to cool the crust to a depth of 2000 m? The thermal diffusivity of crustal rocks is ~ 10-6 m²/s. Give your answer in years.arrow_forward
- Earth's surface area is 5.10x10^8 km^2 .Earth's crust has a thickness (or depth) of 35 km and density 2.8 g/cm^3 for earth's crust. d) Silicon's concentration in earth's crust is 2.72x105grams/ton. Calculate the mass of silicon (in grams) present in earth's crust.arrow_forward8. A 7.3-magnitude earthquake hit eastern Japan late Wednesday night,killing at least four people and injuring over 100 others, and cutting power to millions of homes. a) Determine the amount of energy released by the earthquake in ergs? b) How much energy was released in Joules?arrow_forwardSuppose earthquake A registers two more points on the Richter scale than earthquake B. a. How are their corresponding intensities related? b. How are their released energies related? a. Select the correct choice below and, if necessary, fill in the answer box to complete your choice. O A. A = IB + O B. A = Oc. 'A ='B O D. IA = lB -arrow_forward
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