Which of the following significantly increased the rate of release of carbon dioxide into the atmosphere ?
(a) Rapid deforestation
(b) Massive burning of fossil fuel fro energy and transport
(c) Burning of wood
(d) Forest fire
(e) Combustion of organic matter
(f) Volcanic activity

Think about the following changes and decide whether they are physical or chemical changes. Write the type of change and reasons for that in the table.(a) Twinkling of stars (b) Cooking of vegetables (c) Cutting of fruits (d) Rusting of iron(e) Combustion of magnesium ribbon (f) Burning of candle

Which of the following are chemical changes ? (a) Growth of a plant (b) Rusting of iron (c ) Mixing of iron filings and sand (d) Cooking of food (e ) Digestion of food (f) Freezing of water (g) Burning of a candle

Which of the following are chemical changes ? (a) growth of a Plant (b) Rusting of Iron ( c) Mixing of Iron Filing and sand (d) Cooking of Food ( e) Digestion of food ( f) Freezing of water ( g) Burning of Candle.

Which of the following are chemical changes ? (a) Growth of a plant (b) Rusting of iron (c ) Mixing of iron filings and sand (d) Cooking of food (e ) Digestion of food (f) Freezing of water (g) Burning of a candle