What have Earth Scientists really learned about the effect of astronomical events (such as asteroid impacts) on the biosphere and planet?
Tag Archives: effect
I have a Science Question…?
Posted in 2012
Tagged Asteroid, asteroid impacts, astronomical events, biosphere, Earth, earth scientists, effect, Planet, question, science, science question
biology help (pretest 8)?
1. The rain-shadow effect is tied to ____________.
A. mountains
B. prevailing winds
C. precipitation
D. all of the above
2. What is the most common type of flora found in the temperate forests?
A. conifers
B. hydrophytes
C. deciduous trees
D. epiphytes
3. More than half of all terrestrial species live in the _____________ biome.
A. temperate forest
B. grasslands
C. tropical rain forest
D. chaparral
4. The source point of a river is known as the _________________.
A. headwaters
B. estuary
C. mouth
D. euphotic zone
5. Which of the following lists the correct order (from smallest to largest component) of the ecological pyramid?
A. organism; community; ecosystem; population; biosphere
B. organism; community; population; ecosystem; biosphere
C. organism; population; community; ecosystem; biosphere
D. organism; community; population; biosphere; ecosystem
6. The bays where rivers empty into a marine body are known as _____________.
A. epilimnions
B. estuaries
C. mouths
D. aquifers
7. The relationship between Spanish moss and a tree to which it is attached would be considered _________________.
A. symbiosis
B. commensalism
C. mutualism
D. both symbiosis and commensalism
8. An herbivore is an example of a _____________.
A. producer
B. primary consumer
C. secondary consumer
D. both producer and primary consumer
9. The maximum population size that the environment can sustain on a consistent basis is known as the ________________.
A. carrying capacity
B. pryamid of biomass
C. maximum viable population
D. climax community
10. Which of the following processes takes longer to complete?
A. Primary succession
B. Secondary succession
11. What is the ultimate community in the succession process?
A. pioneer community
B. climax community
C. succession community
D. interim community
12. What results from the fact that consumers do not limit themselves to one type of organism for food?
A. food webs
B. grazer food chains
C. closed communities
D. critical communities
13. If a scientist wanted to predict the population growth over the next 50 years, he/she would most likely use _____________.
A. carrying capacity
B. pyramid of biomass
C. age structure
D. all of the above
14. Which of these is/are greenhouse gases?
A. ozone
B. methane
C. sulfur oxides
D. all of the above
15. What gas is the leading cause of the greenhouse effect?
A. methane
B. nitrous oxide
C. carbon dioxide
D. halons
16. Energy derived from the heat of the earth”s core is known as ______________.
A. solar energy
B. geothermal energy
C. nonrenewable energy
D. both geothermal energy and nonrenewable energy
17. What gas is the leading cause of the greenhouse effect?
A. methane
B. nitrous oxide
C. carbon dioxide
D. halons
18. What was the purpose of the Endangered Species Act of 1973?
A. It banned the sale of ivory form elephant tusks.
B. It placed threatened species under the protection of the U.S. federal government.
C. It arranged for habitat preserves to be created for endangered species.
D. It set up a reward fund for information leading to the arrest of poachers.
19. What is believed to be the major cause of depletion of the ozone shield?
A. carbon dioxide
B. sulfuric acid
C. CFCs
D. nitrates
20. Which of the following are examples of RENEWABLE energy sources (choose as many answers as you think are correct)
A. coal
B. solar energy
C. geothermal energy
D. natural gas
E. wind energy
F. petroleum
Tagged biology, biology help, effect, HELP, pretest, rain shadow effect
When a large comet or asteroid hits the surface of the moon, it…?
A) knocks down trees, but has little or no effect on the surface rocks
B)Bounces off the surface, leaving only a small indentation
C) gouges out a long, narrow trench
D)explodes on impact, producing a large circular crater
Thank you so much!
Posted in 2012
Tagged Asteroid, asteroid hits, comet, effect, moon, surface, surface of the moon, surface rocks, trees
The most important effect in clearing the solar nebula of gas and dust was..?
1. the sun’s magnetic field.
2. the asteroid belt.
3. radiation pressure.
4. impacts by planetesimals.
5. the solar wind.
Posted in 2012
Tagged Dust, effect, field, gas, magnetic field, nebula, solar nebula, sun
What effect would comet bombardment have on the evolution of the primordial atmospheres on terrestrial Planets?
From the abundance of craters on the Moon and Mercury, we know that numerous asteroids and meteoroids struck the inner planets early in the history of our solar system. It is reasonable to suppose that numerous comets also pelted the planets 3.5 to 4.5 billion years ago. There must have been many large icy planetesimals in the Kuiper belt and Oort cloud that collided with each other, producing many large fragments, some that remain out there today. Those that lost a lot of energy during such collisions fell in towards the Sun and some peppered the inner planets with impacts. Much of the water that now exists on Earth, the water that was known to exist on Mars, and evidently the water existed for a brief time on Venus and Mercury were most likely delivered to these planets by these icy fragments.
(a) These impacts probably completely obliterated any atmosphere the planets might have had at that time.
(b) Comets are known to contain lots of organic hydrocarbons, so they probably generated thick atmospheres laden with organic polymers, much like the atmosphere of Titan.
(c) Much of the methane, ammonia and water vapor that marked the early planetary atmospheres also arrived on these fragments. Indeed, methane is broken down by ultraviolet light and hydrogen and nitrogen are released. The hydrogen usually escapes from terrestrial planets but the nitrogen remains in the atmosphere.
(d) They probably punched holes in the crusts of the planets causing natural gas trapped in the crust to be released.
(e) None of the above are likely.
Posted in 2012
Tagged abundance, asteroids, bombardment, COLLISIONS, comet, comet bombardment, comets, craters on the moon, Earth, effect, evolution, fragments, History, icy, inner planets, kuiper belt, mercury, Meteoroids, moon, oort cloud, planetesimals, planets, primordial atmospheres, solar system, sun, terrestrial planets, venus, water