1. The answer is; soil. When rock weathers, it disintegrates into small and smaller particles. When these fine rocks particles combine with organic matter from living organisms, they make soil. The mineral component of the soil is therefore similar to that of the parent rock from which it came from.
2. Chemical weathering involves the reaction of the rock mineral with ‘chemicals’ or other compounds. These may include reaction with organic acids or acidic rainwater. Due to the chemical reaction, the rock chemical composition changes and the physical appearance may also look different.
3. The answer is limestone rocks. They are made of carbon-carbonate minerals. Carbon carbonate is easily dissolved by acids include slightly acidic rainwater/ precipitation.
CO2 + H2O → H2CO3 (carbon dioxide + water → carbonic acid)
H2CO3 + CaCO3 → Ca(HCO3)2 (carbonic acid + calcium carbonate → calcium bicarbonate)
4. Weathering of rocks is slower in cold regions than dry regions. This is because cold places do not encourage chemical weathering. Chemical weathering requires higher temperatures to increase the energies of the chemical atoms so that they react fast.
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Autosomal recessive inheritance: two unaffected people who each carry one copy of mutated gene for and autosomal recessive disorder (carriers) have a 25% chance with each pregnancy of having a child affected by the disorder.
A triploid cell is the structure form during angoisperm fertilization. The cell are created in the process known as double fertilization into the endosperm which is mostly are polyploid. These are typicallly triploids that is they contain three sets of chromosomes but they varies widely from diploid (2n) to 15N.
