The observational fact about a cepheid variable star that leads to a measurement of its distance from earth is that its period of variation is directly related to its

What is the difference between external & internal migration

What is the "great pacific garbage patch"? (a) a large area of marine debris concentrated by rotating ocean currents (b) a large area around the pacific rim where debris collects from natural disasters such as tsunamis (c) an area in the pacific ocean where trash is intentionally dumped due to lack of landfill availability (d) a large trash dump located in hawaii

Describe how ocean currents can affect a moving object ❕❕❕