2Which path shows how humans might get energy from the sun? sun cow humansun cow grass humansun grass cow humansun grass sheep cow human
3Which of the following is an example of condensation in the water cycle? clouds forming in the atmospheredrops of water falling through the airpuddles disappearing on a hot daystreams flowing into rivers
4atmospheric pressure climate precipitation weather A meteorologist records the amount of sunshine, rain, snow, and other meteorological events of a region over a long period of time. Which of the following is he most likely observing?atmospheric pressureclimateprecipitationweather
5Why do large trees have a difficult time living in a tundra? A tundra is too hot for trees to grow large.Animals that live in a tundra destroy most vegetation.Flooding occurs too often in a tundra for large trees to grow.The soil in a tundra is too poor for large trees to grow.
6Which organisms are producers? algaefrogsinsectssnakes
7What is a likely consequence of cutting down rain forests? a reduction in the amount of air pollution on Earthan increase in the number of plants living on Eartha reduction in the variety of organisms living on Earthan increase in the number of arctic ecosystems on Earth
8Which effect does a decrease in sunlight have on a pond ecosystem? an increase in oxygen levelsa decrease in the nitrogen levelsan increase in the algaea decrease in the algae population
9It allows different birds to build better nests. Different types of birds within an environment may feed on different types of organisms. What is a benefit of this type of interaction?It allows different birds to build better nests.It reduces competition between different birds.It causes different birds to reproduce more often.It allows different birds to escape from predators.
10They will become endangered or extinct. A species of giant pandas live only in central China. Bamboo, a tall, green tropical plant, is the main food source for these animals. Large areas of bamboo are being cut down in central China to make room for growing other crops. What will most likely happen to these giant pandas?They will become endangered or extinct.They will migrate to warmer areas of China.They will become carnivores.They will begin to live in caves.
11Where will wind most likely cause erosion? swampsforestsgrasslandsdeserts
12In which location along a river is erosion most likely to be the greatest? at the widest partat the flattest partat the place with the fastest flowat the place with the fewest rocks
13Which best explains how soil is built up in flood plains? Farmers add fertilizer, which makes new soil.Plants break down into compost, which makes soil.Sediment is deposited by rivers during floods.Soil gets used up and the land becomes a desert.
14What are scale models best used to identify? areas of high pollutionanimal habitatsweather patternslandforms
15Which process changes water from a liquid to a gas? precipitationevaporationcoolingcondensation
16Two air masses with large differences in air pressure are near one another. What weather condition will most likely exist between the two air masses?low humidityhigh windsfreezing temperatureclear skies
17Which best describes how air pressure can be affected on hot summer days? The air expands and becomes less dense, creating areas of low pressure.The air expands and becomes less dense, creating areas of high pressure.The air expands and becomes more dense, creating areas of low pressure.The air expands and becomes more dense, creating areas of high pressure.
18a thermometer a barometer a hygrometer a rain gauge A student’s school is located in a valley, and her house is on a nearby mountain. She wonders whether the average amount of rainfall at her school is different from the average amount at her house. She investigates by measuring the rainfall in each location. What tool will the student need to collect the information she needs?a thermometera barometera hygrometera rain gauge
19The dog changes direction. A dog runs 6 meters in one second. By the end of the next second, the dog has traveled an additional 4 meters. Which best describes the motion of the dog during the two seconds?The dog slows down.The dog comes to a stop.The dog changes in mass.The dog changes direction.
20In order for a pulley to work properly, it must be able to overcome which force? electricitygravitylightheat
21Which best describes how forces must interact for a kite to sail up into the air? The force of gravity must be equal to the force of the wind.The force of gravity must be greater than the force of the wind.The force of the wind must be greater than the force of gravity.The force of the person flying the kite must be equal to the force of the wind.
22What is the most likely reason cars are designed with smooth surfaces? to overcome gravityto stop easierto reduce air resistanceto keep the engine cool
23How do desert animals get the water that they need to live? They get water from the food they eat.They get water from streams and rivers.They store water underground when it rains.
24How do decomposers help an ecosystem? They add water to the soil.They make food for animals to eat.They cause dead plants and animals to become part of the soil.
25How does light, temperature, and soil composition influence most land ecosystems? They cause the ecosystem to become extinct.They determine the types of plants and animals in the ecosystem.They cause water in the ecosystem to become polluted.
26Which best describes a landslide? erosion caused by gravityerosion caused by winderosion caused by a river
27Besides providing Earth with fresh water, how else is the water cycle important to Earth? It keeps water from freezing in the ocean.It helps prevent acid rain in the mountain.It helps change the shape of mountains and canyons.
28When will clouds most likely form? when air becomes drywhen condensation occurswhen runoff causes flooding
29What has the most effect on the speed of wind? humiditytemperatureair pressure
30A car travels 200 km in 2 hours A car travels 200 km in 2 hours. If speed = distance divided by time, what is the average speed of the car?100 km/hr200 km/hr400 km/hr
31Two dogs are pulling on the same shoe, but the shoe stays in the same place. What is happening? One dog is pulling with a greater force.Both dogs are pulling with the same force.Both dogs are pulling the shoe in the same direction.
32Three students each build a model car to race down an inclined plane Three students each build a model car to race down an inclined plane. For the race to be fair, what must be true about each car?They all should be the same weight.They all should have the same size tires.They all should be the same length.
33This diagram shows a ball rolling down an inclined plane This diagram shows a ball rolling down an inclined plane. The position of the ball is labeled for each second it travels.Which best describes the motion of the ball?getting faster each secondgetting slower each secondmaintaining the same motionconstantly changing direction