4ExamplesSahara in North AfricaThar in India/PakistanNamib Desert
5Tropical deserts precipitation Dry with very little rainOn average under 1” per year formed by high pressure zones with warm descending air currents but moisture evaporates before becoming rain
6Tropical deserts temperature Generally clear skies allow the sun’s rays to directly beat on the soil making it very hotClear skies also account for cool nights, because there is very little stored heat in sanddeserts are also very dry and hot because the“soil” absorbs verylittle moistureSahara Desert Temperatures
7Tropical deserts SoilDesert soil is low in organic matter and lack the darker soil horizons, they are unable to support much life due to the low precipitation, but are otherwise nutrient rich.Life that the soil can support is sparse and limited to ground-hugging shrubs, and short woody trees.
8Biotic adaptation of plants in tropical desert CactusInstead of producing leaves, desert cacti produce stems and a spine capable of holding and storing enough water to surviveSome cactus have waxy leaves to keep water inLarger cacti need either long or spread out root systems like the saguaro cactus
10Biotic adaptation of animals in tropical deserts Thorny Devil drinks water with its skin “the way the scales on the body are structured, it collects dew and channels it down to the corners of the mouth, where the lizard drinks it. You can actually watch the lizard’s skin darken as it soaks up whatever liquid remains from even the muckiest of puddles” (Zookeeper Rick Schwartz).
11Biotic adaptations of animals in the tropical desert Fennec fox of North Africa has big ears, loaded with blood vessels, allowing the animals to dissipate excess body heat, and thick fur to retain heat during the cold nights.
12Human effects on tropical desert biome Desertification through over farming, deforestation, and overgrazing leads to the creation of more desertsHigher temperatures may produce an increasing number of wildfires that change desert landscapes by eliminating slow-growing trees and shrubs and replacing them with fast-growing grassesLots of oil is in deserts and oil drilling and mining damages deserts that take a long time to re-buildNuclear waste is often dumped in deserts causing wasteland and killing speciesDeserts have been used as nuclear testing grounds causing disruption in the environment even though people don’t live there
13Polar desertThe yellow areas are the cold deserts in the world.
14Cold desert precipitation and temperature the average yearly precipitation ranges from cmannual precipitation has reached a maximum of 46 cm and a minimum of 9 cmthe average winter temperature is between -2 to 4° Cthe average summer temperature is between 21-26° CThe Gobi Desert
15Soil in the cold desert biomes The soil is:heavysiltysaltyrelatively porous and drainage is good so that most of the salt has been leached out
16Cold desert plant adaptations The cold climate and salty soil lead to little plant growthThree common plants are:GrassesshadscaleLichen
17Cold desert animalsEmperor penguins, Skua, and Kangaroo rats are all animals that live in the cold desert biome. They all have adaptation like thick fur or feathers. Also, the Kangaroo rat produces many offspring to better increase its chances of survival as a species.
18Human effects on cold deserts A major problem in cold deserts is desertificationDesertification is caused by:Overusing groundwaterOvergrazingFew humans live there, but ozone depletion and the greenhouse effect cause the colder deserts to warm up