, Earth and Mars are made of rock. Jupiter, Saturn, Uranus and Neptune are made of gas. They are known as "gas giants". Pluto is made of ice.How much do you weigh on Mars?MARS has less gravity (重力) because ……

to the National Evolutionary Synthesis Center’s project.So how much do you know about the giants...让人惊叹的海底巨型动物。THERE are many giants under the sea, animals bigger than many people can imagine ……

giants more than 500 years ago. The stone men could be gods (神), ancestors (祖先) or aliens! How did...洋). There are about 900 stone giants on it.Their bodies are under the ground. We can only see their big heads ……

). Blue whales – the largest animals on Earth – must have even slower heart rates. How slow do... on Earth – must have even slower heart rates. How slow do they go?For the first time, scientists ……

on the Earth. Somebacteria(细菌) feed on methane. If methane were present in the mantle, it could support... only explored the Earth's outerlayer(层), thecrust(地壳). Oil and gas wells normally go no deeper than ……

giants (巨人). Meanwhile, young Princess Isabelle hears a similar story from her mother. Ten years later...) grows out of it. It opens a gateway between the human world and a scary group of giants. The giants ……

at California Speciality Engineering, both based in the US. “People ask me – how can you really tell... rocky Earth, Saturn and Jupiter are made of gas. Powerful lightning storms in the planets ……

Super space seeds (P6)Super space seeds (P6)Choose the answer:Choose the answer:1. How high did the tall shoot rice variety grow for the first month?1. How high did the tall shoot rice variety grow ……

giants on it.Easter Island (复活节岛) is in the Pacific Ocean (太平洋). There are about 900 stone giants... a mythStill a mythPeople made those stone giants over 500 years ago. But what are they? Nobody ……

be some truth in that.On Earth, natural diamonds are formed when carbon-containing minerals (含碳....The planets, which are both around four times bigger than Earth, are each covered by an ocean made up ……

humans lived in outer space instead of on the Earth."The Earth is so dangerous that humans must find...:- Close. It would take only three days to get there.- It's made of the same stuff as the Earth ……

Republic (捷克共和国). A zookeeper is using a puppet to feed (喂) it. The bird is a Javan green magpie (爪哇绿鹊). These green magpies are one of the most endangered (濒危的) birds on Earth. Only about 50 of them ……

潜入深海，发现蔚蓝世界的奥秘！ Seen from outer space, Earth is a blue planet (星球). This is because the ocean... of the ocean’s animals and plants. They test how warm and clear the water is. They also find ship or plane ……

at the melting Pasterze glacier in Austria.   VCG  Some of Earth’s land is going upSome of Earth’s land is going up气候变暖，冰川融化，山脉“反弹”气候变暖，冰川融化，山脉“反弹&rdquo ……

below the Earth’s surface. 3. How is the fifth layer different from the inner core... is the passage about?A. What textbooks tell us about Earth. B. How scientists are studying Earth.  ……