1. what economic system is characterized by the exchange of one product for another?
a. currency
b. barter
c. loan
d. free market
2. the communist concept of collectivism in china has
a. declined as private enterprise has fostered a booming economy
b. been reinforced due to levels of poverty
c. been maintained due to strong, chinese religious beliefs
d. been forced onto many chinese peasants by the government because they have little wealth
3. which international initiative aims to put the human race on a path of sustainability?
a. the earth summit
b. agenda 21
c. kyoto protocol
d. dashboard of sustainability
4. to increase the production of crops india relies on this.
a. elimination of immigration restriction laws
b. existing bartering laws
c. advanced methods of irrigation
d. increased use of plant fertilizers
5. unlike most of the asian population, most europeans live,
a. in suburbia
b. in cities
c. in rural areas
d. away from the water
6. w

Iceland has taken advantage of its geology to meet a. political needs b. energy needs c. cultural needs d. economic needs answer b. energy needs

Study guide for unit 2 ~ lesson 3 ,4, & 5 test, thursday, january 24th lesson 3 vocabulary erosion - deposition - landform- weathering- short answers 1. how do volcanic islands form? 2.why is deposition likely to occur outside a river bend? 3. in what conditions does soil form fastest? 4. which 2 earth’s systems interact to form a coral island? 5. a beach growing in size is most likely the result of 6. which type of islands are formed when a chunk of land breaks off from a larger landmass? long answers explain how plants can grow in small cracks of rock that do not appear to contain soil. lesson 4 vocabulary pollution - toxic - short answers 1. most farmers pollute soil by purposefully adding 2. what is the benefit of contour plowing? . 3. using nuclear power to produce electricity can cause water pollution by 4. why do scientists predict humans will run out of fossil fuels someday? 5.farmer spray crops with fertilizer and weed killer to the crops grow. how might this affect the hydrosphere? list two different ways you use fossil fuels. 1- 2- what are two other energy sources scientists and engineers are researching? 1- 2- lesson 5 vocabulary decompose- recycling - short answers 1. which of earth’s systems do you interact with when you wash your hands? 2. which of earth’s systems is polluted by exhaust gases from buses pollute? 3. why is it important to dispose of electronic devices properly? 4. where do people interact with all four of earth’s systems?

What is most often given a value of zero to describe an object’s position on a straight line? displacement reference point distance ending location