If a tree dies and the trunk remains undisturbed for 13,750 years, what percentage of the original ¹⁴c is still present? (the half-life of ¹⁴c is 5730 years. ).

What is a good tip to follow in the day you take the aspire test or psat

Winds are formed from the sun's uneven heating of the earth's atmosphere. the wind patterns are altered by bodies of water, different landforms, and plant cover. because of this, the wind is considered a form of

Afish fossil is found in a rock. a foot bone and tooth are found in an older layer of the same rock. what can scientists learn from the rock? a) the area changed from land to water. b) the area changed from water to land. c) the area has always been land. d) the area was once an ocean.