Altogether there are some ten thousand of these volcanoes on earth, all but a few hundred of them extinct.

Behaving in this selfless and devoted manner, these little creatures have survived on earth, for more than 140 million years, far longer than dinosaurs.

Earth Day, marked on 22 April, is an annual event aiming to raise public awareness about environmental protection.

Her journey to becoming the fastest woman on earth has been anything but smooth and effortless.

It explores the heights with Go Ape, the high wire forest adventure course, or journey beneath the earth at Poole's cavern.

It is the responsibility to protect our earth.

It seems obvious that these have made humankind the most powerful animal on earth.

No matter what you like to do, there is a way to get involved in various activities on earth day.

Since the first earth day in 1970, Americans have gotten a lot \greener\ toward the environment.

We've grown so used to this orange haze that the original glory of an unlit night--dark enough for the planet venus to throw shadow on earth.

America will remain the best place on earth to do business, so long as Barack Obama and the Democrats in Congress resist the temptation to interfere too much, and so long as organised labour does not overplay its hand.

It also slows down more as you move faster, which means astronauts (宇航员) someday may survive so long in space that they would return to an Earth of the distant future.

There's no way on earth that genes from an alga should work inside an animal cell, says sidney pierce from the University of South Florida.

Actually, space technology helps people on Earth every day.

As the water is pumped out, the vacant space left is compacted by the weight of the earth above.

Spin-off technology is space technology that is now used on Earth.

That's about the same distance as 337 round trips from Earth to Pluto.

They want to know how space research helps people on Earth.

The protection and improvement of the human environment is a major issue which affects the well-being of peoples and economic development throughout the world, read the final declaration from this gathering, the first of a sequence which would lead to the Rio de Janeiro Earth Summit in 1992 and the World Development Summit in Johannesburg three years ago.

One recent study warns us of the danger of the exhaustion of natural resources on Earth.

One recent study attempted to calculate the extent of this ecological overshoot of the human economy, and found that we are using 1.2 Earth's-worth of environmental goods and services—the implication being that at some point the debt will be called in, and all those services—the things which the planet does for us for free—will grind to a halt.

Asked what they would like to change in the world, the students mentioned only personal concerns such as slowing down the pace of life, gaining good friends, becoming more spiritual, becoming either more materially successful or less materially oriented ( ' , depending on the student's values), and being more respectful of the Earth, animals and other people.

Their behaviors can be found in almost all teenagers on earth.

It is estimated that Antarctica boasts of the richest reserves of fresh water on earth.

When the molten rock of the earth’s core forced its way to the surface to form the throat of a volcano, as the centuries passed, the rock cooled and hardened, shrinkingand cracking into long columns.

Sweden has gone farther than any other nation on earth to integrate the sexes and to offer women the same opportunities and freedoms as men.

The perpetual argument is that funds are tight, that we have more pressing problems here on Earth.

In our times, human shrewdness has mastered the deep mysteries of the earth at a level far beyond the capacities of earlier peoples.

The earth will experience extreme weathers.

\The protection and improvement of the human environment is a major issue which affects the well-being of peoples and economic development throughout the world,\ read the final declaration from this gathering, the first of a sequence which would lead to t

Asked what they would like to change in the world, the students mentioned only personal concerns such as slowing down the pace of life, gaining good friends, becoming more spiritual, becoming either more materially successful or less materially oriented d

In the rusty red deserts of South Africa, steep-sided rocky hills called inselbergs rear up from the plains like the bones of the earth.

Measurements of density and composition implied that Venus originally formed out of basically the same stuff as Earth.

Some have 26 vanished from the face of the earth, others are dying slowly, but all have 27 undergone changes as they have come into contact with an 28 expanding machine civilization.

The greatest concern the authors raise is space debris一pieces of \junk\ that orbit the earth, with the potential to cause serious damage if they collide with operational units, including the ISS.

The sun was considerably less bright back then, so Venus was arguably a cozier habitat for life than earth.

The surface formed mostly in the last billion years, which makes it fresher and more recently active than any rocky planet other than Earth.

They're primarily designed for Low Earth Orbit(LEO) an easily accessible region of space from around 200 to 800 miles above Earth, where human-tended missions like the Hubble Space Telescope and the International Space Station(ISS) hang out.

Thus, our picture of Venus at around the time life was getting started on Earth is one of warm oceans, probably rich with organic molecules, splashing around rocky shores and volcanic vents.

Venus has long been held up as a cautionary tale for everything that could go wrong on a planet like Earth.

within their compact bodies these minute satellites are able to house sensors and communications receivers/ transmitters that enable operators to study Earth from space, as well as space around Earth.

Before each of their revelations, many thinkers at the time had sustained more ancient ways of thinking, including the geocentric view that the Earth was at the centre of our universe.

Copernicus theorized in 1543 that in actual fact, all of the planets that we knew of revolved not around the Earth, but the Sun, a system that was later upheld by Galileo at his own expense.

Over the past decade, the focus has been on climate change——how the warming of the Earth from greenhouse gases is leading to conditions that worsen fires.