1. what is the result of a rock undergoing physical weathering? 2. how does chemical weathering change rock? provide examples. 3. what kinds of rocks weather most rapidly? 4. why is weathering slow in cold, dry places? ~!

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.

The right answer is Spindle.

In cell division, the mitotic spindle or achromatic mitotic apparatus of a cell refers to a structure of microtubules arranged in a spindle-shaped (i.e. swollen in the middle) bipolar assembly.

The achromatic spindle, meiotic spindle or mitotic spindle, is the set of microtubules that flow from the centrioles during the processes of cell division, whether mitosis (mitotic spindle) or meiosis (achromatic spindle or meiotic spindle), and range from centromeres of chromosomes to centrioles at the poles. They come from the centrosome (in the animal cell) or from the microtubule organizing center (in the plant cell). In the metaphase, all chromosomes are arranged in the equatorial plane of the dividing cell, and during anaphase, each of the two chromatids in which a chromosome is divided is driven to one of the two poles of the cell by said microtubules. The kinetochores are proteinaceous leaves located in the centromeres of the chromosomes in which the microtubules of the mitotic or achromatic spindle are anchored.