Reading for Vocabulary is a four-level reading series for young learners of English at ages 10 or above. The series aims to develop young learners’ vocabulary and overall language skills through exposure to a variety of topics. The series instructor Brian Stuart provides for learners a highly dynamic and entertaining lessons. So learners will be able to learn a large number of vocabulary with fun and ease.

💓Lesson 15 As the Earth Moves
Weather changes from day to day and month to month. But did you know it also changes from year to year, and not just every few years, but over millions of years? Short-term changes make sense because we see and feel them. Long-term changes aren’t so easy to comprehend.
The seasons are well-understood. As Earth orbits around the Sun, different parts are exposed to different amounts of sunlight. For six months the Northern Hemisphere is directly facing the Sun, and so the weather is warmer there. For the next six months the Southern Hemisphere is facing the Sun, so it is warmer there and colder in the north. The cycle starts again when the Earth completes its 12-month orbit around the Sun.
Then there are ice ages. An ice age is a period of time when the poles are covered by ice year-round.
There have been five ice ages on Earth, each lasting for millions of years. Most people think the last ice age ended thousands of years ago, but technically we are still in it!
Within an ice age, there are warmer and colder periods. Right now the Earth is in a warmer period that has lasted for about 11,000 years. One reason for these cycles of warm and cold is the Earth’s elliptical orbit around the Sun. Because it isn’t a perfect circle, it actually changes slightly over thousands of years.
From studying changes in the Earth’s orbit, scientists think the Earth should be heading into a colder period right now. But it is actually getting warmer! Many scientists think humans are responsible. It’s hard to tell though, because there are so many other factors to consider. Maybe humankind hasn’t been on Earth for long enough to really understand these ancient cycles!

💓 Check out other YouTube English-learning resources at WorldCom Edu
Sight Words with animations: [ Ссылка ]
Sight Word Lessons with Brian Stuart: [ Ссылка ]
Easy Story House(Read Along stories for kids): [ Ссылка ]
Brain Bank Kindergarten Science : [ Ссылка ]
Brain Bank Kindergarten Social Studies: [ Ссылка ]
Reading Start(3 level reading program for children): [ Ссылка ]

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