I am in the 12th grade.

I need project ideas that deal with the environment (rocks, weather, soil, etc)

How does density change by changing the mass without changing the volume and by changing the volume of a substance without changing the mass?

Theresa comes up with four examples of waves: sound wave, ocean wave, light wave, and hand wave. which of theresa'as examples is not an actual scientific wave? sound wave ocean wave light wave hand wave

When amoeba reproduce, they replicate their DNA and then divide in half. Thus, A. very few of the offspring's genes come from one parent. B. none of the offspring's genes are identical to those of the parent. C.

A screw incorporates which other simple machine?

Melting water is an example of a physical change because the atoms are pulled apart to form a new substance. bonds are broken and atoms are rearranged. the identity of the substance does not change.

A light-year measures the distance a light beam can travel in one year. One light-year is equal to 9 500 000 000 000 kilometers.

The first ionization energy, e, of a potassium atom is 0.696 aj. what is the wavelength of light, in nm, that is just sufficient to ionize a potassium atom? values for constants can be found here.

A gene is a to a chromosome as (A) a pea is to a pod (B) a front to a back (C) a bike is to a car (D) a building is to a window

How are you enjoying this weather? (i need good reasons}

In today's experiment, some lab students let their chromatograms elute slightly longer than others. If one student's solvent front traveled to 9.80 cm, and another student's solvent front traveled 8.