金绿宝石(Chrysoberyl) 1、主要特征 成分:BeAl2O4 晶系:斜方,二轴晶,正光性(+)

钻石晶莹剔透、光芒四射并有 “钻石恒久逸一颗永流传”的赞誊, 这些都是由钻石的基本性质决定的

当光波从一种介质传到另 种介质时,其传播速度和方 向会发生改变这种现象叫折 射。光在入射介质中的传播 速度与折射介质中的传播速 度之比,等于入射角正弦与 折射角正弦之比

一、复习 二、观察分析忍考 三、引入新课内容

What is Metamorphism?1) Metamorphism is the change in form that happens in Earths crustal rocks in response to changes in temperature and pressure

Introduction: Sediments In The Rock Cycle Sediments are transported by: Water. ce Wind. Gravity. The transport and deposition of sediments are initial phases of the rock cycle. The ultimate fate of most sediment is burial and conversion to sedimentary rock

Introduction: Weathering The Breakdown of Rock At the Earth's surface, rocks are exposed to the effects of weathering: the chemical alteration and mechanical breakdown of rock, when exposed to air, moisture, and organic matter. Weathering is an integral part of the rock cycle. Weathering converts rock to regolith

Introduction: Earth's' Internal-- Thermal Engine Magma is molten rock beneath Earth's surface. Because liquid magma is less dense than surrounding solid rock, and obviously more mobile, magma, once formed, rises toward the surface. Magma that reaches the surface does so by erupting through vents we call volcanoes

Introduction: What Is an Igneous rock? Igneous rocks vary greatly. Some contain large mineral grains. Others contain grains so small they can barely be seen under a high power microscope. Igneous rocks also vary greatly in color. All igneous rocks are formed through the cooling and solidification of magma

Introduction: What Is Mineral? Mineral Naturally formed, inorganic, solid material with a specific chemical composition and a characteristic crystalline structure. Rock Naturally formed, coherent mass of one or more minerals, sometimes including organic debris