Summers are caused by a. a combination of longer days and more direct rays from the sun. b. less direct rays from the sun. c. longer days and longer nights. d. earth in its orbit moving closer to the sun.

A

Explanation:

Earth does not move closer to the sun via orbiting. The factor that creates seasons is it's axis tilt, which makes part of the Earth receive more sun than the other lower half. That's why the equator has the most sun overall. Every day has the same 24 hours but during the summer the days are longer and it is exposed to more sunlight.

answer: c. the experiment shows that the red substance experienced a chemical change.

explanation: chemical change is the change in which chemical composition of the substance changes. physical change is the change in which there is no change in chemical composition.

chemical changes are accompanied by following changes:

a) precipitate formation

b) energy is released or absorbed

c) formation of bubbles

d) change in color

as it is given that the red color has disappeared and there is production of gas, it means the red substance has undergone a chemical change.

e