1. troposphere is the layer nearest to the ground. which of the following do not describe the layer?
A. weather phenomena occurs C. wind constantly moving
B. temperature below is higher than above D. temperature below is lower than above
2. the different layer varies in height. which of the following is the basis of scientists in diving the atmosphere into layers?
3. greenhouses vary in sizes. which of the following describe how a greenhouse work?
I. it allows sunlight to pass through. III. it prevents heat from escaping
II. it prevents sunlight to pass through IV. it allows heat to escape
A. I&II C. I&IV
B. II&IV D. II&III
4. The greenhouse effect is a natural phenomenon. without a natural greenhouse effect, the temperature of the earth would be about -18 degrees Celsius of 14 degrees Celsius at present. why are scientist concerned about the greenhouse effect?
A. there is no technology that will keep the temperature of earth constant.
B. planting trees in wider areas is not possible; earth has many desert areas
C. human activities like burning of fossil fuels and deforestation enhance the greenhouse effect.
d. human population is increasing rapidly; more carbon dioxide will be released to the atmosphere.