Question

1. carbon dioxide is called a greenhouse gas for which of the following reasons?

a. it absorbs and reradiates infrared radiation to warm the earth.
b. it is produced when coal and/or fossil fuels are burned.
c. it is often used inside greenhouses.
d. its oxygen component is needed by plants to grow.

1. what are the major barriers preventing us from being able to convert to renewable energy?

a. economics
b. geography
c. intermittency
d. all of the above

1. what is upwelling?

a. currents traveling the wrong direction in the pacific
b. cold dense water floating on warm water
c. melting of ice causing freshwater to float on salt water
d. rising of cold nutrient rich water from deep in the pacific

1. which type of fuel creates the most pollution?

a. nuclear
b. coal
c. wind
d. biomass

1. which characteristic is common of developing countries?

a. slower growth rate
b. longer life expectancy
c. lower fertility rate
d. higher infant mortality

Explanation:

Question 35

Carbon dioxide is a greenhouse gas that absorbs and reradiates infrared radiation to warm the Earth (greenhouse effect). Option b is incorrect as it's produced by burning fossil fuels, not when they are burned (the process of burning produces it). Option c is incorrect as plants need carbon dioxide, not oxygen. Option d is incorrect as it's not an oxygen component. So the correct reason is option a.

Major barriers to renewable energy conversion include economic factors (costs), geographical limitations (resource availability), and intermittency (unreliable supply like solar/wind). So all of these are barriers.

Upwelling is the rising of cold, nutrient - rich water from deep in the ocean (e.g., in the Pacific). Option a is about wrong - direction currents, option b is about water density layers, option c is about ice melting and freshwater - saltwater interaction. So the correct definition is option d.

Answer:

a. It absorbs and reradiates infrared radiation to warm the Earth.

Question 36