Weekly Review #8

Approximately 2.2 billion years ago, which gas was first added in large amounts to Earth's atmosphere from life-forms that evolved in the oceans?

• carbon dioxide

• water vapor

• oxygen

• nitrogen

Which mineral will scratch fluorite, galena, and pyroxene?

• graphite

• calcite

• olivine

• dolomite

Which weather variable generally decreases when wind speed is increasing, clouds are thickening, and visibility drops?

• relative humidity

• dewpoint

• precipitation

• air pressure

Which radioactive isotope is most often used when determining the age of fossil bones found in sediments deposited during the Holocene Epoch?

• carbon 14

• potassium 40

• uranium 238

• rubidium 87

An air mass originating over Mexico is classified as

• cP

• cT

• mP

• mT

What is the dew point when the air temperature is 28°C and the relative humidity is 47%?

• 8°C

• 13°C

• 16°C

• 19°C

Clouds are formed when moist, rising air

• contracts and cools, and water vapor condenses

• contracts and warms, and water evaporates

• expands and cools, and water vapor condenses

• expands and warms, and water evaporates

Which two mantle hot spots are located at mid ocean ridges?

• Iceland and Yellowstone

• Galapagos and Tasman

• St. Helena and Hawaii

• Easter Island and Bouvet

Approximately how many million years ago (mya) were all of Africa and South America inferred to be located south of the equator?

• 59 mya

• 232 mya

• 119 mya

• 359 mya

What is the texture of inorganic land-derived sedimentary rocks?

• bioclastic

• clastic

• crystalline

• vesicular