12/1/11 Page 60 The currents in Earth’s oceans are affected by temperature. The following diagram shows an ocean current. Which of the following causes the effect represented by the cold water arrow? A. Cold water is less dense than warm water B. Cold water is more dense than warm water. C. Cold water contains less salt than warm water. D. Cold water contains more salt than warm water. 12/5/11 Page 62 The Coriolis effect causes all freely moving objects in the air to curve instead of travel in a straight line. The Coriolis effect happens in both the Northern and Southern Hemispheres. How do objects curve in the Southern Hemisphere as a result of the Coriolis effect? A. to the left B. to the right C. to the north D. to the south 12/6/11 Page 62 Josefina is working on a computer model of upwelling. She uses an arrow to represent the movement of water. What should she use to represent the cause of upwelling? A. a figure of the sun B. an arrow representing wind C. labels indicating temperature D. arrows showing surface currents 12/7/11 Page 64 Each layer of the geosphere has mass. Which layer has the most mass? A. core B. crust C. ocean D. mantle 12/8/11 Page 64 Look at the following image of a greenhouse. A greenhouse is a building where plants are cultivated. It traps some of the incoming solar radiation and, therefore, becomes warmer than the surrounding environment. Which gas acts similarly to this greenhouse in its effect on the atmosphere? A. argon B. carbon dioxide C. nitrogen D. oxygen 12/12/11 Page 66 Meggie measures the wind speed every day for 7 weeks. She constructs the following line graph of the average weekly wind speed. How many of the 7 weeks experience average wind speeds greater than 7.9 km/h? A. 4 weeks B. 5 weeks C. 6 weeks D. 7 weeks 12/13/11 Page 66 Bob knows that water in a geyser is warmed by energy from deep within Earth. To investigate this process, he warms 2 L of water from 25 °C to 100 °C. Which property of the water will decrease? F. density G. volume H. kinetic energy I. thermal energy 12/14/11 Page 68 Sometimes fires burn down large areas of forests that are part of the biosphere. Other than the biosphere, which of Earth’s other spheres is a forest fire most likely to affect? F. geosphere G. cyrosphere H. atmosphere I. hydrosphere 12/15/11 Page 68 In the eighteenth century, the trade winds played an important role in England’s merchant fleet crossing the Atlantic Ocean. This is how the trade winds got their name. In the tropics, in which direction do the trade winds drive equatorial ocean currents? A. eastward B. northward C. southward D. westward