if it has erupted in the last 10,000 years.In ancient times, more than 80 percent of the earth.... Gas from volcanoes formed the earth’s atmosphere (大气).Volcanoes come from very hot liquid rock ……

LONDON: Scientists have identified dozens of asteroids as remnants of a larger space rock that was smashed apart a relatively recent 5.8 million years ago — a finding that could yield clues to how ……

as it ever was.Indeed, this huge rock in space is like Earth’s key, both to our past and our future...人类为什么要将探索月球进行到底？There probably aren’t many people throughout history who’ve never looked up ……

IF scientists are right, planet earth is 31 years away from a major disaster. A small asteroid... last June. They have announced that it could hit the earth, causing huge damage, in 2036 ……

people in ancient China appreciated the wonders of diamonds. Some 6,000 years ago, people in China may... wascorundum(金刚砂).Rubies(红宝石) andsapphires(蓝宝石) are coloured forms of corundum.Finding corundum ……

tell history of EarthStone forest and volcanic island in Greece tell history of Earth希腊... is an area of forest that was turned into stone through mineralization (矿化). Within it are ancient ……

. It’s hard work – it takes experience to tell an ordinary rock from a stone tool...;s hard work – it takes experience to tell an ordinary rock from a stone tool, or tell ……

to the discipline (学科) called “natural history”.From cloud gazing (注视) and bird-watching to rock observing, ever... to the discipline (学科) called “natural history”.It began with ancient philosophers, including Aristotle from ……

seem to some the last place where you would ever want to learn about extinct ancient creatures... to some the last place where you would ever want to learn about extinct ancient creatures of the past ……

,200 years, the new finding, if proven, could rewrite the history of transportation.  You might... finding, if proven, could rewrite the history of transportation.    Jingtoushan site ……

over 1,000 pieces of cultural relics including carved jade, gold, bronze, stone and ivory artifacts... in 2001. Historians believe they are the remains of the ancient Shu Kingdom (古蜀) mentioned in stories ……

autonomous region西藏札达桑达隆果墓地This grave site is a key finding to understand the early history of Tibet....This grave site is a key finding to understand the early history of Tibet. The grave was used from BC 366 ……

;PROVIDED TO TEENS  Students learn the ancient art of stone appreciation           Students learn the ancient art of stone appreciation        ……

Learn too much historyTom: I wish I’d lived in ancient (古代的) times.Teacher: Why?Tom: Then I won’t have so much history to learn.Round or square?Teacher: What is the shape (形状) of the Earth?Gerald ……

uses. We can make them in laboratories. Usually, gemstones form below Earth’s surface. They can... gemstones on their own. They try to imitate the Earth’s process. Each gem has a “recipe” with certain ……