(10 points) 2. The five boxes below represent a geologic cross-cut with five layers (A is on top and E is on
Score
the bottom). The types of rocks are listed on the right side. In each box, write the appropriate
type of rock and explain the answer in relation to the history of the earth's atmosphere.
Answs
A
Limestone layers
|Banded-iron formations
R
Metamorphic rocks with fine grains
Red beds
Chert layersl

Limestone:

This rock is formed from sediments that gather on the river floor over time & Limestone is mostly found in rivers, caves, etc. This resource is made from natural activity, for example, sediments travelling through the river & the water causing it to settle.

the enthalpy of formation of water is given as -285.8kj/mol, which states that the enthalpy of formation is negative.

negative enthalpy of formation indicates that the heat is released during the reaction process. the heat is released from reaction to the surroundings the enthalpy is expressed with a negative sign with the energy given out in the reaction process.

the formation of water takes place by giving out heat which is -285.8 kj/mol.