The geologic time scale is divided by major changes in the fossil record.

a. True

b. False

What is emitted by volcanoes that mix with water vapor to produce acid rain?

Iodine solution turns in the starch which colour

Radioactive decay of 40K atoms in an igneous rock has resulted in a ratio of 25 percent 40K atoms to 75 percent 40Ar and 40Ca atoms. How many years old is this rock? (1) 0.3 10^9 y (3) 2.6 10^9 y (2) 1.3 10^9 y (4) 3.9 10^9 y

How many elements are found in most minerals?

The oldest material found on Earth is a zircon grain that is 4.12 Ga. How come there are no rocks that are the same age as Earth (4.54 Ga) ? (A) No rocks formed during that time. (B) All rocks from that age have been recycled.

Which of the following is an example of a conditional statement

According to the map the trade route between ancient Egypt and the Indus Valley was approximately

The average temperature on planet Earth is higher than you would expect just from the heating of sunlight alone. What is the explanation for this?

What are 4 types of air masses that affect the continental us?

Which term describes a section of Earth's structure below moving continents as parts of large plates? A. continental crust B. earth core C. asthenosphere D. divergent boundary