A sample is found to contain 1/32 of a parent isotope. How many half-lives have passed since this sample formed?

Earth is currently 150 million km away from the Sun. If Earth was 200 million km away from the Sun, it would no longer support life because - 1) the surface water would evaporate. 2) the temperature would be too cold.

Which land surface characteristics produce the greatest amount of insolation at earth's surface

First englishman to circumnavigate the globe

The Appalachian mountains were formed during this Era. A. Precambrian B. Mesozoic C. Paleozic D. Cenozoic

Distinguish between a rug and carpet.

Trees in deciduous forest do what? A. Shed leaves during one season B. Grow in a warm Mediterranean climate C. Have needlelike leaves D. Grow in a climate that is cold year round

How many miles long is the great wall of china

What landforms are created at convergent boundaries?

In which direction does the Sun appear to move across the sky? Ofrom west to east from east to west from north to south from south to north

What is a planetary nebula neither a planet nor a nebula?