true or false? A canopy of water once shielded man from the sun's radiation.

the half-life of plutonium-239 is 24,110 years. How much of an original mass of 100.0 grams remains after 96,440 years?

They come in many different shapes and sizes what rock is it sedimentary igneous metamorphic

Which of the following best describes the relationship between cells in living things in general? A. The larger the living thing, the larger Are its cells B. All living things are made up of one or more cells C.

If a substance has ph of 3.2 what is the poh

A seismograph uses a ... to record drums vibration

Which statement is true for the given reaction? Zn + PbSO4

A student states the following: "Since acetone (nail polish remover) evaporate more readily than water, one would assume that acetone has weaker intermolecular forces than water." Evaluate their claim. (2 sentences)

A catalyst can only be used once. True False

On what basis do we distinguish between substances and separate them from one another?

What is the net ionic equation for the following reaction? H2CrO4 + Ba (OH) 2