With the knowledge of bill of materials (Table 3) and labor hours (Table 4), the total cost for. manufacturing the steel vessel is calculated and summarized in Table 5. Given that the steel vessel. has a storage capacity of 564 kg of CGH2, its cost is $539 per kg of stored hydrogen.
Prehistoric (Archaeological) & Historic Periods. The Prehistoric Period consists of time periods in the origin and evolution of humankind from about 2.5 million years to about 900 BCE. the Prehistoric Period is divided into the Archaeological Periods of the Stone, Bronze and Iron Ages.
The Two Epochs. The Quaternary Period can be divided into two major epochs; the Pleistocene and the Holocene.. The Pleistocene epoch started 1.8 million years ago and ended around 11,000 years ago, while the Holocene started 11,000 years ago and still continues today.cientists refer to the era as the Age of Humans, the time was when hominids gained a foothold on earth. All of the plants and animals that we see today are part of the Quaternary Period; however, there are also extinct animals and plants that lived on the earth during its early stages.