Earth Science Section 25.3 Homework: Climate Change: Due Friday, 5/31/13

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Read Sections 25.3, pages 641-646. Answer the questions that follow.

Last Name, First Name *

Period (Number Only) *

Summarize how Milankovitch Cycles seen under the heading of "Orbital Changes" have caused changes to Earth's climate. *

Evidence exists that shows that glaciers once covered places like India that are now on the Equator. What could explain these observations? *

Earth is likely to be warmer when *

there are greater numbers of sunspots on the Sun

there are fewer numbers of sunspots on the Sun

there are more volcanic eruptions of sulfur dioxide

Earth is farther from the Sun

Volcanic eruptions can cause cooling of Earth's climate. How could this be the case? Explain. *

Anthropogenic (human induced) causes of climate change have been widely discussed lately in the media, scientific community, and in political arenas. Give three examples of human activities that are leading to anthropogenic climate change. *

Read "Connection to Chemistry: Oxygen Isotopes" on page 642 to answer this question. Shells of marine species in sea floor sediments are analyzed and higher levels of heavy oxygen 18 are found. This means that the climate during that period was *

warmer, as more heavy oxygen was stored in the oceans

cooler, as more heavy oxygen was stored in the oceans

warmer, as less heavy oxygen was stored in the oceans

cooler, as less heavy oxygen was stored in the oceans

Glacial ice cores are analyzed and higher levels of carbon dioxide are found . This means that the climate during that time period was *

warmer

cooler

the same climate

Wetter years in climate records are indicated by *

thicker tree growth rings

thinner tree growth rings

the same sized tree growth rings

tree growth rings cannot be used to gauge past climates

Ocean levels will rise as a result of the melting of *

ice already floating in the ocean

ice flowing from a glacier on land in to the ocean.

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