1/How did the amount of rain change as the mountains got higher?/More rain fell on the top./Less rain fell on the top./More rain fell at the bottom./The rain stayed the same.
2/How did the amount of rain and clouds change as the air got colder?/Clouds formed lower down./Clouds formed higher up./Less rain fell./The rain stayed the same.
3/When clouds blow across a mountain from west to east, which parts get the most rain?/The mountain top./On the bottom of the mountain./On the east side of the mountain./All over the mountain.
4/On which day would the clouds be lower? A cold, moist day or a warm, moist day? /The cold day./The warm day./They would be the same./You can't tell.
5/The highest parts of Yellowstone are mountains in the east and west. The central valleys are lower. What parts of Yellowstone do you think are driest?/The central valleys./The western mountains. /The eastern mountains./Sylvan Pass.
6/When you go into cold air, you can see your breath. Why do you think that happens?/All of these./The moisture condenses./The moisture makes a "cloud."/The cold air can't hold the moisture.
@/2/Elk&Beaver/M03S01/Tower 1/2
1/How did the valley change between 1900 and 1970 with few elk?/More willows in 1970./Fewer beaver in 1970./Fewer aspen in 1970./All of these.
2/How did the valley change between 1900 and 1970 with many elk?/More conifers in 1970./More willows in 1970./More aspen in 1970./All of these.
3/Why do you think more willows grew when there were few elk and many beaver?/All of these./Beaver ponds made the valley wetter./Elk didn't eat so many willows./Willows used water from the ponds.
4/What happens when there are too many elk?/Elk eat all the new aspen shoots./Elk scare away the beaver./Elk eat the beaver./All of these.
5/Beaver cut down aspen trees to make their dams. Why do new aspens keep growing?/All of these./Aspen shoots come back from the roots./Aspen like water from the dam./Beaver let some shoots grow.
6/How do you think a stream would change with lots of beaver dams along it?/All of these./Dams would soak up a flood./There would be more willows./Water would flow more slowly.
@/3/Elk Population/05/Lamar 1/3
1/What happens to the elk population if there are no hunters and no wolves?/It rises, then falls./It falls, then rises./It keeps rising./It keeps falling.
2/Elk eat grass and willows. What happens when there are no hunters and no wolves to kill the elk?/When there are many elk, there is less food./When there are many elk, there is more food./Food stays the same./Food disappears.
3/Why does the elk population fall with no hunters and no wolves?/There isn't enough food so they die./They leave Yellowstone./They don't have calves./They jump in rivers and die.
4/Who eats the elk carcasses? /All of these./Coyote and grizzly bear./Bald eagles and ravens./Insects and bacteria.
5/How many hunters and how many wolves do you need to keep the elk population steady? Do any other numbers work?/Any of these keep the numbers about steady./Hunters=0, Wolves=150./Hunters=600, Wolves=100./Hunters=800, Wolves=50.
6/Wolves, mountain lions, and bears hunt elk. They kill old, sick, and very young elk. Do you think this makes the herd healthier or sicker?/ Healthier: the strongest live./ Sicker: the calves die./ The herd stays the same./ Sicker: the strongest live.
@/4/Hot pool color/M02S03/Norris 1/4
1/A pool bottom has rings of pink, yellow-green, orange, and brown. Which ring might have boiling hot water?/Pink./Yellow-green./Orange./Brown.
2/What is the temperature of the yellow-green area?/150 F/180 F/120 F/90 F
3/If the weather is cloudy, do any of the algae change color?/Yes, from orange to green./Yes, from green to orange./Yes, from pink to orange./No. The algae don't change.
4/Hot pool algae use green chlorophyll to collect sunlight and make food. What do they do when it's cloudy?/Turn green to gather more light./Turn orange to gather more light./Turn pink to gather more light./They die.
5/Last year, a pool was mostly green in May, but then orange in July. Why did the color change?/May was cloudier than July. /The pool was colder./New algae grew./July was warmer than April.
6/Green and orange algae use their colors to collect sunlight and make food. What do the pink bacteria in the hottest water eat?/Stuff from nearby dead algae./All of these./Boiled bagels./Fried ice cream.
@/5/Beetle epidemic/06/Grand Canyon 1/5
1/How many times did the forest have an epidemic?/Two./One./Three./Four.
2/Did you see any patterns in how the beetles spread?/All of these. /They started one place, and moved next door./They left the place they started at./They finished at a different place.
3/How do you think beetles get from one tree to the next?/They crawl or fly short distances./They fly long distances./They migrate on elk and other animals./They always live on the trees.
4/What do you think would be the best way to stop a mountain pine beetle epidemic?/Kill the beetles at the epidemic's edges./Kill the beetles in the epidemic's middle./Spray the whole forest with chemicals./Spray chemicals far from the beetles.
5/If the weather is wet, does the number of beetles change? /Little rain usually means lots of beetles./Lots of rain always means lots of beetles./Lots of rain usually means lots of beetles./Little rain always means lots of beetles.
6/Why do you think the beetles move to different places in the forest?/All of these./The beetles kill all the sick, old trees./The beetles leave the healthy trees./The beetles move to find other sick trees.
@/6/Geyser11/Old Faithful 1/6
1/Which geyser had the biggest eruption?/Tall and narrow./Tall and wide./Short and narrow./Short and wide.
2/Which pool was the least bubbly?/Short and wide./Tall and narrow./Tall and wide./Short and narrow.
3/Why do you think the tall, narrow geyser had a bigger explosion than the short, wide one?/All of these./Bubbles build up in the narrow pipe./Pressure doesn't build up in the wide pipe. /Water shoots out the long "gun barrel" of the tall pipe.
4/What shape pot of water do you think would boil more vigorously?/Tall and narrow./Short and wide./Tall and wide./Short and narrow.
5/What would happen if water was heated past boiling in a pressure cooker and then the lid suddenly came off?/Water would explode into steam./Water would boil softly./Water would freeze./Water would turn red.
6/There are many superhot places in the deepest parts of the ocean. Do you think water boils down there?/No, pressure keeps steam from forming./No, the water is too cold./No, there are no stoves down there./All of these.
@/7/Fishy Food Chain/09/Yellowstone Lake 1/7
1/Animals higher in a food chain eat things lower in the food chain. What is at the bottom of the river food chain?/A tiny plant./A big animal./A small insect./A small animal.
2/What is at the top of the river food chain?/A big animal./A tiny plant./A small insect./A small bird.
3/What land animals are in the river food chain?/Grizzly bear and osprey./Cuthroat trout and redside shiner./Bighorn sheep and deer./Beaver and woodpecker.
4/What other animals are sometimes part of a river food chain?/All of these./Otters and beavers./Pelicans and ducks./Moose and muskrats.
5/What are some things in the middle of a river food chain?/Small fish and big insects./Water lillies and algae./Bears and otters./All of these.
6/What are some insects in the river food chain?/Stonefly nymphs and water striders./Caterpillars and ants./Wasps and bees./All of these.
@/8/Design a Plant/10/Sylvan Pass 1/8
1/What grows on a sunny mountain ridge?/Hairy Milkvetch./Mullein./False Hellebore./All of these.
2/What kinds of plants grow on sunny, dry hillsides?/Short with fuzzy leaves./Tall with big, smooth leaves./Short with big, smooth leaves./All of these.
3/What kinds of plants grow on shady river banks?/Tall with big, smooth leaves./Tall with little, fuzzy leaves./Short with little, fuzzy leaves./All of these.
4/Why do you think the hairy milkvetch's fuzzy leaves help it live on rocky, dry mountain slopes?/All of these./Hairs shade leaves from bright sun./Hairs keep leaves moist./Hairs protect leaves from the wind.
5/How do you think stonecrop can live on cold, dry cliffs?/All of these./Its fat leaves store rainwater./It grows low and close to the rock to stay warm. /Its little leaves don't lose much water.
6/Why do you think plants growing on the tops of high mountains are short?/Short plants stay close to the warm ground./Short plants don't get enough water to grow tall./Short plants don't get enough sun to grow tall./All of these.
