What does an unstable isotope give off that a stable isotope does not?

Which of the following are causes of coastal erosion? check all that apply. beach grasses and other plants trap windblown sand. wave action carves away the coastline. groundwater under pressure is forced to earth’s surface. artificial structures stop the natural flow of sand along the coast. underground caves collapse as bedrock is dissolved.

When water freezes, it . contracts expands

Which of the following types of stars are dim but can have high surface temperatures? giants main sequence stars supergiants dwarfs