Skimming and scanning

65 million years ago the Cretaceous period ended. Many believe it ended abruptly. Sources vary widely regarding the changes that occurred, but on average they state that between 50 and 75% of all plant and animal life perished at this time. Of the animals, only amphibians and mammals survived. Fossilized dinosaur remains were first discovered in the mid-1800s. Since then, the reason for their demise has intrigued both scientists and lay-people. The most reliable testable hypothesis concerning their extinction was proposed by Alvarez and Alvarez in 1980.

Walter Alvarez, a geologist, was collecting sedimentary samples near Gubbio, Italy, working as part of a team measuring iridium. Not commonly found in Earth's crust and mantle, iridium has been regularly detected in scientific samples from other parts of the solar system; in other words, the team was searching for cosmic dust. Alvarez discovered - again, sources vary - a layer between 1 and 2 centimeters thick at the point believed to mark the boundary between the Cretaceous and Tertiary periods. This layer had an iridium content 30 times higher than its surrounding layers.

Q1. Fossilized dinosaur remains were first discovered in

• the mid-1800s.

• the Cretaceous period .

• the Tertiary period

• the boundary between the Cretaceous and Tertiary periods.

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According to the passage, which of the following is widely believed of the Cretaceous period?

• Between 50 and 75% of all plant and animal life appeared at that time.

• Everyone agrees what happened at the time.

• It ended suddenly

• It is the current geological period

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The most recent testable hypothesis concerning the extinction of the dinosaurs was proposed in

• National Geographic magazine

• 1880

• Popular Science magazine

• 1980

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What is iridium?

• A common Earth element.

• An element found only on Venus

• Cosmic dust

• an element found only in Italy

What is scanning?

• Quickly reading over a text to get the general gist.

• Quickly reading over a text to find some specific information which is focused upon.

• Taking the time to understand the whole text in depth.

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What is skimming?

• quickly reading over a text to get the general gist.

• quickly reading over a text to find a specific piece of information which is focused upon

• taking the time to understand the whole text in depth.

Tags

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3. Looking through a Google search list is an example of...

• Skimming

• Scanning

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Looking up the meaning of a word in the Dictionary is an example of...?

• Skimming

• Scanning

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Look for key words related to the topic

• Scan

• Skim

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CCSS.RI.11-12.10

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Looking through a magazine to check what articles to read is an example of...?

• Skimming

• Scanning

Tags

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CCSS.RI. 9-10.10

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