Scientific knowledge in Grade Seven It is divided into several units, the first chapter is Star Tour, the second chapter is day and night and four seasons, and the third chapter is earth The fourth chapter is the changing topography, the fifth chapter is the organisms on the earth, the sixth chapter is the main groups of organisms, the seventh chapter is biodiversity, and the eighth chapter is the biosphere on the earth

Scientific knowledge in Grade Seven It is divided into several units, the first chapter is Star Tour, the second chapter is day and night and four seasons, and the third chapter is earth The fourth chapter is the changing topography, the fifth chapter is the organisms on the earth, the sixth chapter is the main groups of organisms, the seventh chapter is biodiversity, and the eighth chapter is the biosphere on the earth

1. The largest land in the world is Eurasia. The smaller land is island. The largest island in the world is Greenland. It is surrounded by water on three sides and connected with the continent on the other side is peninsula

On the knowledge of Science (Autobiography of the earth) in the seventh grade
For example, you can also look at question 5 in book p109, where I don't understand: we are somewhere on the earth. How can we tell where the sun is?

In fact, it's very simple. Isn't there a map? There are three maps of the earth on page 108. The intersection of the map in the middle is the position of noon. Because the sun rises in the East and sets in the west, the beginning of the day must be in the East, so it's noon in the middle. Isn't there a direction indicating the earth's rotation on the earth's axis? From west to East, and

Science seven: common plants
Plants living in arid environment for a long time will have a series of adaptive characteristics in morphology and other aspects
A. It has developed root system
B. Having a thick fleshy stem
C. It has a thick cuticle
D. The leaf area increased

Choose D
The larger the leaf area, the more the water evaporates. This kind of plant is not suitable to grow in the arid environment
The developed root system is good for plants to absorb water from the soil, the thick fleshy stem is good for water transportation and preservation (such as cactus), and the thick cuticle can reduce water evaporation. These characteristics are good for plants to adapt to the arid environment