Reducere. A piece of silk is smooth. Tree bark is rough. Why are some objects smooth and others rough? Find out in this series about materials and their prop...
pebble books, carti, carte straina, mathematics & science
Reducere. A pencil is stiff. A rubber band is bendable. Why are some objects stiff and others bendable? Find out in this series about materials and their pro...
pebble books, carti, carte straina, mathematics & science
Reducere. A bowling ball is heavy. A feather is light. Why are some items heavy and others light? Find out in this series about materials and their propertie...
pebble books, carti, carte straina, mathematics & science
Reducere. Hills aren't as tall as mountains, but they are still amazing landforms. Movement of Earth's crust form some. Wind and rain move dirt to form other...