What Is Rock?
What Is Rock? To geologists, rock is a coherent, naturally occurring solid, consisting of an aggregate of minerals or, less...
السبت، 27 فبراير 2016
Something Precious, Gemstones
Something Precious, GemstonesThe Hope Diamond.Mystery and romance follow famous gems. Consider the stone now known as the Hope Diamond, recognized by...
الجمعة، 26 فبراير 2016
Mineral Classification
Mineral Classification The 4,000 known minerals can be separated into a small number of groups, or mineral classes. You may think, “Why...
السبت، 20 فبراير 2016
How Can You Tell One Mineral From Another?
How Can You Tell One Mineral From Another? Amateur and professional mineralogists get a kick out of recognizing minerals. They might hover...
Crystals and Their Structure
Crystals and Their Structure What Is a Crystal? Some characteristics of crystals.The word crystal brings to mind sparkling chandeliers, elegant wine goblets, and...
الجمعة، 19 فبراير 2016
What Is a Mineral?
What Is a Mineral? To a geologist, a mineral is a naturally occurring solid, formed by geologic processes, that has a crystalline...
الاثنين، 15 فبراير 2016
What Drives Plate Motion, and How Fast Do Plates Move?
What Drives Plate Motion, and How Fast Do Plates Move? Forces Acting on Plates We've now discussed the many facets of plate tectonics...
How Do Plate Boundaries Form and Die?
How Do Plate Boundaries Form and Die? The configuration of plates and plate boundaries visible on our planet today has not existed...
Special Locations in the Plate Mosaic
Special Locations in the Plate Mosaic Triple Junctions Examples of triple junction. The triple junction are marked by dots.Geologists refer to a place...
الأربعاء، 10 فبراير 2016
Transform Plate Boundaries
Transform Plate BoundariesThe concept of transform faulting.When researchers began to explore the bathymetry of midocean ridges in detail, they discovered that...
Convergent Plate Boundaries and Subduction
Convergent Plate Boundaries and Subduction At convergent plate boundaries, two plates, at least one of which is oceanic, move toward one another....
Divergent Plate Boundaries and Sea-Floor Spreading
Divergent Plate Boundaries and Sea-Floor Spreading The process of sea-floor spreading.At a divergent boundary, or spreading boundary, two oceanic plates move apart...
