The ratio of horizontal component and vertical component of earth's magnetic field is v2: 1. Find the angle of dip at that place.
​

If a balloon is taken outside on a very cold day, what will occur?

1. how to locate the image in converging(concave) mirror and diverging (convex) mirror with salt. 2. how to locate the image in a converging (convex) lens and diverging (concave) lens with salt.

Scientific models are based on current knowledge, which can limit their effectiveness when new discoveries are made.