Hiệu ứng nhà kính:

+ hiện tượng trái đất nóng lên, do bức xạ sóng ngắn của mặt trời 

+ do nguồn khí co2 tăng cao (do chặt cây, phá rừng, ô nhiếm môi trường, khí thải của các nhà máy, xí nghiệp, vv)

Ảnh hưởng của hiệu ứng nhà kính:

+ băng tan, mực nước biển tăng cao ->đất đai nhiễm mặn

+ xảy ra các hiện tượng thời tiết cực đoạn (bão, lũ, lốc xoáy,...)

+ hiệu ứng nhfa kính đã khiến trái đất nóng lên, một số sinh vật vì vậy không thể tồn  tại được

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Hình a: Khi đưa hai đầu của hai thanh nam châm đến gần nhau:

Khi hai thanh nam châm cùng cực thì đẩy nhau.

Khi hai thanh nam châm khác cực thì hút nhau.

Hình b: Khi bị đun nóng đường thì đường sẽ bị nóng chảy biến đổi thành chất khác là than và nước.

Hình c: Đem bình thủy tinh chụp kín cây thì sau một thời gian cây không thể tiếp tục phát triển bình thường và có thể chết vì thiếu oxi.

Hình d: Nhúng chiếc bút chì vào cốc nước thì ta thấy bút như bị gãy ở mặt nước. Bởi hiện tượng khúc xạ ánh sáng mà tia sáng từ đầu dưới nước của chiếc bút trên đường truyền từ vật vào mắt ta đã bị gãy khúc tại mặt phân cách giữa hai môi trường.

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iểm khởi hành cách

a) Đường kính hình tròn đó là:

     6,28 : 3,14 = 2 ( m )

b) Bán kính hình tròn đó là: 

     188,4 : 3,14 : 2 = 30 ( cm )

             Đáp số: a) 2 m      b) 30 cm