Alex saw a rusty old car in an abandoned lot. because he had recently read about chemical reactions, he began to wonder how the rust formed. what happened to cause the rust on the steel car? a. a decomposition chemical reaction took place when the iron in the steel mixed with oxygen to form rust. b. oxygen in the air reacted with the paint on the car and formed rust c. a physical change took place in the steel of the car to form rust d. oxygen in the air chemically combined with iron in the steel to form rust.

The big bang nucleosynthesis theory states that elements were produced in the first few minutes of the big bang while elements have their origins in the interiors of stars, forming much later in the history of the universe.

Imagine that a new planet is discovered with two moons of equal mass: moon a and moon b. the mass of the new planet is greater than the combined mass of its moons. moon a is farther away from the new planet than moon b. what is the planet's gravitational pull on moon a compared to the planet's gravitational pull on moon b? the planet's gravity repels moon a with a greater force than it repels moon b, which is why moon a is farther away. the gravitational pull on moon b is greater than on moon a because moon b is closer to the new planet than moon a. the gravitational pull on moon b is greater than on moon a because moon b is farther away from the new planet than moon a. the gravitational pull on moon a is the same as the gravitational pull on moon b because distance does not affect the planet's gravity.

Which fossil fuel is mainly used for heating and cooking? a. electricity b. coal c. petroleum d. natural gas