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23 Cards in this Set
- Front
- Back
Nebular Hypothesis
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currently accepted argument about how a Solar System can form
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solar nebula
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Our sun and the planets formed at the same time, 4.5 billion years ago, from a large rotating cloud of interstellar dust and gas called
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thermonuclear fusion
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After sufficient mass and density was achieved in the Sun, the temperature rose to one million °C, resulting in
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Today, astronomers and planetary geologist, divide the planets, moons, asteroids and comets into three compositional groups, based upon their melting points
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TEST QUESTION
Rocks Gases Ices |
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when was there life on Earth
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by 3.5 billion years ago, there was life on Earth
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stromatolites
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3.5 billion year old fossilized algae mats are the remains of some of the earliest known life on Earth
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cyanobacteria
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Stromatolitesare formed in shallow seas or lagoons when millions of cyanobacteria(a primitive type of bacteria) live together in a colony
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Eukaryotes
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Nucleus-bearing cells
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Adaptive radiation
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describes the diversification of species originating from a common ancestor to fill a wide variety of ecological niches
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genetic drift
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the change in the relative frequency with which a gene variant (allele) occurs in a population
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biodiversity
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the variety and variability among living organisms and the ecological complexes in which they occur
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Species diversityor species richness
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the number of species that occur in a given area or ecosystem
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biome
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a climaticallyand geographically defined area of ecologically similar climatic conditions such as communitiesof plants, animalsand soil organisms; They are often referred to as ecosystems
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monsoon
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a seasonal prevailing windthat lasts for several months
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Savannas
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occur in tropical and subtropical areas that are not wet enough to support rainforests
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Deserts
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occur in areas where rainfall is less than 25 centimeters (10 inches) per year
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Temperate grasslands
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regions with rainfall of about 25 to 75 centimeters (10 to 30 inches) per year, that have grasses and other herbaceous plants as the most prominent flora
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TEST QUESTION
Taiga |
The Taiga across Russia is the largest continuous forest on Earth
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There are two major divisions or zones in the marine biome
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Pelagic zone
Benthic zone |
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pelagic zone
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the water column between the surface and the bottom, which is typically 3 to 4 miles (5-6 kilometers) in thickness out in the open ocean
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photic zone
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the upper part of the pelagic zone where light penetrates allowing the process of photosynthesis to occur
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benthic zone
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refers to organisms that live on or in the sea floor, whether they occur along the sea shore, on the continental shelf or out on the abyssal plains
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TEST QUESTION
riparian zone |
the area along the river or stream bank consisting of cattails, reeds, willow and other plants that tolerate high moisture; This zone also provides critical habitat for many organisms
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