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Climate scientists have measured the temperature on every part of the Earth over many years. They look at the changes and predict the future. In most parts of the world, the temperature has increased by a few degrees and scientists think it will increase in the future.

Question : Climate scientists have studied (a)   in the Earth's temperature and found that it has increased in most parts of the world.

One of the biggest issues of climate change is that ice at the poles is melting. This causes sea levels to rise and can lead to flooding in coastal areas. Animals that live in these cold places are also losing their homes. This is why some animals, like polar bears, are in trouble.

Question : Polar ice melt causes rising (a)   , leading to coastal flooding and home loss for polar animals.

Climate experts have been able to predict storms and warn people in advance. However, there are still weather events that are difficult to predict, like tornadoes. Scientists are working to improve their technology, but it takes time to understand all the factors that cause these events.

Question : Scientists are working to improve their technology to (a)   weather events.

Climate change is a big problem for the world today. It means that the weather on Earth is getting warmer very quickly. The main cause of this warming is human activity, such as using cars and factories. These actions cause the greenhouse effect. Over time, the planet's overall temperature increases.

Question : The Earth is getting warmer very quickly. The (a)   is human actions, which lead to the greenhouse effect.

Lake Vostok in Antarctica is 14,000 square kilometres and freezing cold. Unfortunately, it's been under a sheet of ice for 15 million years. The ice is 3.7 kilometres deep so it's impossible to get to, though scientists have taken water from it.

Question : Lake Vostok in Antarctica is 14,000 square kilometres and freezing cold with a 3.7-kilometre-thick. (a)   on it.

Astronomers are exploring space, looking for new planets or a new Earth for humans to live on in the future. First of all, astronomers look for a star. That's because our Earth orbits a star (the sun). When astronomers have found a star, they look for planets around it.

Question : Astronomers are looking for a new Earth by first looking for a star, then (a)   around it.

To find a new Earth, first, astronomers look for a star. Then, they look for planets around it. Once they find a new planet, it's also important to measure the distance between the planet and the sun. That's because most planets (unlike our Earth) are either too near to the star or too far away.

Question : To find a new Earth, astronomers look for a star and planets around it. Then they (a)   from the planets to the sun.

The Merume Mountains is in Guyana in South America. But they are at the end of the Mazaruni river, so that's one for someone who also likes boats and maybe swimming - it's one of the most dangerous rivers in the world.

Question : The Merume Mountains in Guyana are at the end of the dangerous (a)  

The Amazon rainforest is not as quiet as it used to be. Every year, more people visit. Some come to see wildlife, while others come to cut down trees for farming. This is bad for the plants and animals living there.

Question : The Amazon rainforest is not as quiet as before because people come there to (a)   or cut down trees for farming.