Meredith wants to use a model to study how interesting formations such as arches, towers, and balanced rocks are made by erosion. she learns in science class that these can form when different layers of the rock erode at different rates. meredith decides to use running water to cause the erosion. to model the rock, she can choose from the following: potting soil clay pebbles plaster sand how should meredith make her model of the rock? a. by using each material to make a separate model b. by arranging the possible materials in strips, one next to the other c. by mixing all the materials together evenly d. by arranging the possible materials in layers, one on top of the other reset submit

Ahigh energy (high speed) particle (alpha or beta or neutron) are shot at the target;

1. why does the same side of the moon always face earthc.the rotational period of the moon is equal to one revolution around earth2. which is greater the moons period of rotation or its period of revolution  b.the moons revolution period around earth3.what was the major accomplishment of the apollo missions  c.sending the first human into space4. which of these space missions involved the deployment of lunar roversa. voyager 15. which scientists are going to explore next on kepler-186fd. evidence of existence of life6.which mission is not going to explore the outside of the solar  systemb.safir7.which technology limit the future of space explorationb. scientist must first develop certain technologies before missions can be completed.

Van der waals forces are temporary electromagnetic forces established between uncharged atoms. some neutral molecules, when close together, can become temporarily “charged,” as electrons move around the atom. water is a polar molecule, the side of the molecule that the hydrogens bond to being more positive, and the opposite side bound to the lone pairs of electrons being more negative. this means that it participates in dipole-dipole interaction (non-polar exhibits dispersion forces), and it has the capacity for hydrogen bonding.