There are literally dozens of good project management software applications out there, with Microsoft Project being one of the most popular mid-range project management packages, and the likes of Primavera being popular at the higher end. 1  IT leadership & CW500.  IT architecture.
Intrusive Igneous Rocks. Many kilometers below the Earthâs surface, molten rock called magma flows into cracks or underground chambers. There, the magma sits, cooling very slowly over thousands to millions of years. As it cools, elements combine to form common silicate minerals, the building blocks of igneous rocks. These mineral crystals can grow quite large if space allows. Rocks that form in this way are called intrusive igneous or plutonic rocks. The mineral crystals within them are large enough to see without a microscope. There are many different types of intrusive igneous rocks but granite is the most common type. Last modified June 17, 2003 by Lisa Gardiner.
Sketch of magma deep in the earth (right): USGS Images. Intrusive vs. Extrusive Igneous rocks can be classified into two main categories: intrusive and extrusive. A trick to help kids remember intrusive and extrusive is to think of intrusive -- inside and extrusive -- exit. Intrusive rocks come from magma.They cool slowly deep in Earth's crust.ntrusive vs. Extrusive Igneous rocks can be classified into two main categories: intrusive and extrusive. A trick to help kids remember intrusive and extrusive is to think of intrusive -- inside and extrusive -- exit. Intrusive rocks come from magma. They cool slowly deep in Earth's crust.