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23 Cards in this Set

  • Front
  • Back
Nebular Hypothesis
currently accepted argument about how a Solar System can form
solar nebula
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
thermonuclear fusion
After sufficient mass and density was achieved in the Sun, the temperature rose to one million °C, resulting in
Today, astronomers and planetary geologist, divide the planets, moons, asteroids and comets into three compositional groups, based upon their melting points
when was there life on Earth
by 3.5 billion years ago, there was life on Earth
3.5 billion year old fossilized algae mats are the remains of some of the earliest known life on Earth
Stromatolitesare formed in shallow seas or lagoons when millions of cyanobacteria(a primitive type of bacteria) live together in a colony
Nucleus-bearing cells
Adaptive radiation
describes the diversification of species originating from a common ancestor to fill a wide variety of ecological niches
genetic drift
the change in the relative frequency with which a gene variant (allele) occurs in a population
the variety and variability among living organisms and the ecological complexes in which they occur
Species diversityor species richness
the number of species that occur in a given area or ecosystem
a climaticallyand geographically defined area of ecologically similar climatic conditions such as communitiesof plants, animalsand soil organisms; They are often referred to as ecosystems
a seasonal prevailing windthat lasts for several months
occur in tropical and subtropical areas that are not wet enough to support rainforests
occur in areas where rainfall is less than 25 centimeters (10 inches) per year
Temperate grasslands
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
The Taiga across Russia is the largest continuous forest on Earth
There are two major divisions or zones in the marine biome
Pelagic zone
Benthic zone
pelagic zone
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
photic zone
the upper part of the pelagic zone where light penetrates allowing the process of photosynthesis to occur
benthic zone
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
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