ph tells us when a substance is ________. *\n...
ph tells us when a substance is ________. *\na. an acid or a base\nb. solid or liquid\nc. melting or freezing\nd. none of the above\n\nthe earths day and night is due to due_______ *\na. the tilt of the earth\nb. bombardment by meteorites\nc. unequal heating of the earths surface\nd. rotation of the earth on its axis\n\nwhat is the effect of increase in human population on earth?\na. non renewable resources are depleted\nb. people lose their jobs\nc. it has a negative impact on climate change\nd. a and c
Answer
# Brief Explanations:
1. pH is a measure that indicates whether a substance is an acid or a base. A pH below 7 is acidic, a pH above 7 is basic, and a pH of 7 is neutral.
2. The Earth's day - night cycle is caused by the rotation of the Earth on its axis. As the Earth rotates, different parts of it face the Sun, creating day and night.
3. An increase in human population leads to the depletion of non - renewable resources due to higher consumption, and also has a negative impact on climate change through activities like increased energy use and deforestation.
# Answer:
1. A. an acid or a base
2. D. rotation of the Earth on its axis
3. D. A and C