Water is an essential resource for life on Earth. Considering how vital and precious water is, it is almost unbelievable that it can be used so carelessly. Sewage, toxic chemicals, fertilizers, pesticides, oil, metals, and solid trash pollute the water in lakes, streams, and oceans around the world. Water Resources explores the ways in which water on Earth has become polluted--and what people a…
From the time of the very first humans struggling to survive, people have constantly come up with simple new ideas and amazing inventions that changed their lives for the better. This book investigates road construction and human-made buildings around th
Every October Americans celebrate the discovery of their hemisphere by Christopher Columbus. But the navigator from Genoa was not the first to find his way to these shores. From the Stone Age through the 16th century, America was "discovered" again and again. An exciting and unique way to celebrate the Columbus quin centennial and the history of our country.
seri ini menceritakan cara membuat benda-benda disekitar kita yang sudah sangat kita kenal. dari bahanmentah sapai selesai, tahap demi tahap dijelaskan secara sederhana dengan foto-foto dari mesin yang digunakan.
Pernahkah kamu merasa ingin tahu, bagaimana sepatumu di buat?'