World Geography
The R-horizon of soil horizon consists of

weathered parent material
plant litter at various levels of decomposition
unweathered bedrock
None of these

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World Geography
The sequence of layers of atmosphere from earth to upwards is

troposphere, stratosphere, stratopause, mesosphere , ionosphere
troposphere, tropopause, stratosphere, thermosphere, exosphere
troposphere, tropopause, stratosphere, stratopause, mesosphere, mesopause, ionosphere(thermosphere, thermopause, exosphere)
troposphere, tropopause, stratosphere, mesosphere , exosphere, thermosphere, thermopause

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