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Desert & Tundra Biomes.

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by

jarrett barnes

on 2 October 2012

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Transcript of Desert & Tundra Biomes.

Desert Biome Desert biomes cover one 5th of
the earths surface. The climate in subtropical deserts
(hot deserts) is mainly just hot and
dry. There isnt many plants in these
deserts, but some low down plants. Only a few animals can survive
in this type of heat. The animals are more small and have to have the ability to burrow underground. These animals can only come out at night because they cant handle the heat and sun. Hot and Dry Deserts temperature ranges from 20 to 25° C. The extreme maximum temperature for Hot Desert ranges from 43.5 to 49° C These hot deserts usually have little rainfall or concentrated rainfall in short periods between long rainless periods This averages out to be about
15 Centimeters a year. Hot Deserts are warm throughout the fall and spring seasons and very hot during the summer. the winters usually has very little, if any rainfall All the plants are almost all ground-hugging shrubs and short woody trees Tundra Biomes (cold Deserts) A cold desert is a desert that has snow in the winter instead of just dropping a few degrees in temperature like they would in a subtropical desert. one of the few things that grow
there is maybe some moss or
grass. It never really gets warm
enough for plants to grow. Just like the Hot deserts, animals have to burrow into the ground in order to stay warm. (not stay cool like the hot deserts) Cold Deserts are near the Arctic part of the world. Cold Deserts temperature in winter ranges from -2 to 4° C and in the summer 21 to 26° C a year they usually have lots of snow. They also have rain around spring. This averages out to about
15-26 Centimeters a year. Cold Desert's plants are scattered. In areas with little shade.



about 10 percent of the ground is covered with plants In some areas of sagebrush it reaches 85 percent http://www.blueplanetbiomes.org/desert.htm
There are many differences between the two, for example, it rains more in the Tundra. In the Hot Desert it is a lot dryer and it hardly ever rains. It snows in the Tundra whereas in the Desert you could only dream of snow. There is a huge difference in temperature between the Tundra and the Hot Desert. http://www.nexuslearning.net/books/holt_env_science/6-3.pdf http://www.blueplanetbiomes.org/desert.htm http://www.ucmp.berkeley.edu/exhibits/biomes/deserts.php http://www.worldbiomes.com/biomes_desert.htm http://www.ucmp.berkeley.edu/glossary/gloss5/biome/tundra.html http://www.blueplanetbiomes.org/tundra.htm http://www.worldbiomes.com/biomes_tundra.htm Many deserts are found in bands along 30 degrees latitude north and 30 degrees latitude south
Many deserts form around 30 degrees latitude because this region is the subtropics. The subtropics experience high air pressure, which means clouds will not form, and because there are no clouds, there is no precipitation
Another reason you get deserts is because they are far inland and thus far from a body of water that can provide the humidity for clouds and rain. The two main adaptations that desert animals must make are how to deal with lack of water and how to deal with extremes in temperature Since water is so scarce, most desert animals get their water from the food they eat: succulent plants, seeds, or the blood and body tissues of their prey animals have bodies designed to save water. Scorpions and wolf spiders have a thick outer covering which reduces moisture loss http://www.woodlands-junior.kent.sch.uk/Homework/adaptations/desert.htm Desertification (aridization) Desertification is the persistent degradation of dryland ecosystems Across the world, desertification affects the livelihoods of millions of people who rely on the benefits that dryland ecosystems can provide. In drylands, water scarcity limits the production of crops, forage, wood, and other services ecosystems provide to humans Some 10 to 20% of drylands are already degraded, and ongoing desertification threatens the world’s poorest populations and the prospects of poverty reduction desertification is one of the greatest environmental challenges today and a major barrier to meeting basic human needs in drylands Tundras Cold desert extremely cold temp. Low biotic diversity
Short season of growth
and reproduction
nutrients and energy is
dead organic material Large population oscillations
temperature is between -2 to 4° C and summer temperature is between 21-26° C Has chances of getting snow animals sagebush can approach 85 percent snow chances of rainfall harsh conditions extreme temps.
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