A gas is given off when two substances are mixed.
<u>physical change: A copper rod is hammered into a thin sheet. </u>
A solid forms when two clear liquids are mixed.
A matchstick changes color when it burns.
explanation
a physicals change vs chemical
physical change is like cutting, changing shape etc, it the molecules that make it and the chemicals of it stay same
chemical change when it chemically changed such as cooking meat
Answer:
Gravity
Explanation:
Gravity keeps things together. Think of it in 2 ways:
1.Without gravity, an Earth-orbiting satellite would go off into space along a straight line. With gravity, it is pulled back toward Earth.
2.Gravity keeps the earth round, pushing it on all sides, which is what gives it its round shape.
Hope it helps!! =D
Plants produce carbohydrates for themselves through the process of photosynthesis. The carbon cycle is carried out when these carbohydrates are passed along the food chain to animals and other consumers.