Radioisotopes tell scientists that Earth is how old?

A. 65 million years

B. 500 million years

C. 4.5 billion years

D. 13.4 billion years

What is the reduction half-reaction for the reaction of zinc with hydrochloric acid?

Which statement about climate is true? A. The climate of an area can change from one day to the next. B. Climate is atmospheric conditions in an area over a long period of time. C.

What are the elements CO2 and PU

How do atoms usually combine? In a way that makes each atom less stable. In a way that makes each atom more stable. In a way that increases the number of valence electrons. In a way that decreases the number of valence electrons.

Which direction does air circulate into low pressure zones in the northern and southern hemisphere

In which changes of state do atoms lose energy?

Can you live without body tissue? This is a yes or no question, no explaining required, but you can add it if you want. : D

According to the graph, which activity has used the largest amount of water over the past twenty years?

Tiffany leaves balloons filled with helium gas inside her car in on a sunny day when she returns to her car some some of the balloons are much larger and a few have popped explain what happened

If the pH indicator bromothymol blue was added to the nitric acid solution, it's colour would be?