what are a few (1 or two) reasons why the core cant be of lonestones?
To find reasons why the core can't be made of limestone, we can consider the properties and composition of limestone. Limestone is a sedimentary rock primarily composed of calcium carbonate.
1. Temperature and Pressure: The Earth's core is the innermost layer, consisting mainly of a solid inner core and a liquid outer core. The temperature and pressure at the core are extremely high. Limestone, being a sedimentary rock, is formed from the accumulation of shell remains and sediment over millions of years under relatively low pressure and temperature conditions. It is not capable of withstanding the intense heat and pressure at the Earth's core.
2. Melting Point: Limestone has a relatively low melting point compared to the temperatures found at the Earth's core. Limestone typically melts at around 825 to 900 degrees Celsius (1517 to 1652 degrees Fahrenheit). In contrast, the temperature at the Earth's core is estimated to be about 5,000 degrees Celsius (9,000 degrees Fahrenheit). The high temperatures would cause limestone to melt, rather than remain solid.
Thus, based on the extreme temperature and pressure conditions, as well as the low melting point of limestone, it is not possible for the Earth's core to be composed of limestone.