New Roof Installation vs. Repair. Just because your roof springs a leak doesn't mean you need to call a roofing contractor right away. It's important to distinguish the cost of a new roof -- almost $6,500 on average -- versus the much more affordable $550 to repair a roof.
Report Abuse. 1  Beginning Of The Modern Age. 2  No Age has an absolutely definite start (or finish). 3  Technically, the medieval period ended and the modern era began when Columbus discovered America, or at least some islands in the New World, in October 1492.  Every single day for the last ten thousand years.
By the end of the Proterozoic Period, Earth was well along in its evolutionary processes leading to our current period, the Holocene Period, or Anthropocene Period, also known as the Age of Man. Thus, about 525 million years ago, the Cambrian Period began.angea formed some 225 million years ago and would evolve into the seven continents we know today. Free oxygen began to build up around the middle of the Proterozoic Period â around 1.8 billion years ago â and made way for the emergence of life as we know it today.