How do astronomers believe an irregular galaxy forms?
A) They are regular galaxies that are distorted by the gravity field of a large nearby galaxy.
B) They are young galaxies that have not yet developed a more regular form.
C) They form when an elliptical and a spiral galaxy merge.
D) They are two or more galaxies that have not completed their merger.
E) Several regular galaxies of different sizes merge.
A
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Earth's radiation is often referred to as ____ radiation, while the sun's radiation is often referred to as ____ radiation
A) shortwave; longwave B) shortwave; shortwave C) longwave; shortwave D) longwave; longwave
The best sites for tidal electric plants are
A. near small islands in the Pacific Ocean. B. bays with narrow openings. C. fast flowing rivers near the coast. D. adjacent to wide beaches near the equator.
Which type of climatic event is most concerning to residents of South and East Asia?
a. monsoons b. typhoons c. cyclones d. tsunamis e. insulations
Define family planning, and explain why it is critically important to all other aspects of development. What is meant by an unmet need for family planning?
What will be an ideal response?