The age of a rock in years is known as a. Index age b. Relative age c. Half life age d. absolute age

The age of a rock in years is known as D. absolute age.

Explanation: When geologists and scientists date a fossil or a rock using geologic methods, such as by measuring the amount of radioactive material in it, they are calculating the "absolute age" of that rock/fossil.

Index age is a term probably invented by the one who made this question, and it does not exist. Relative age might have been a tempting choice, but it is not really correct as it is like "looking at a cake." Scientists estimate the age of a layer by the order of where it is. Half life age is used to calculate the time required for a substance to be reduced half of its original value.

temperatures get warmer — and heatwaves are more common. nothing says summer like warm weather. this rise in temperatures is caused by the tilt of the earth's axis. our planet doesn't sit perfectly straight as it spins — it has a slight lean of approximately 23.5 degrees with respect to the sun, called the axial tilt.

explanation:

polar areas, such as antarctica or the south pole.