Why is the light year a useful unit of measurement for astronomical distances?
What will be an ideal response?
The size of the universe is vast; the light year is therefore a useful unit of measurement for distances of such galatic scale.
You might also like to view...
Gateway cities are those that
A) arise where two physical areas meet or at the border between two cultures. B) are surrounded by walls. C) developed in European countries. D) were established during the Industrial Revolution.
Which is not one of the eight UN Millennium Development Goals?
A) Ensure environmental sustainability. B) End poverty and hunger. C) Reduce child mortality. D) Equal access to consumer goods E) Develop a global partnership for development.
Why are inlets through barrier bars or barrier islands not closed by longshore drift of sand?
a. Such inlets are always the outlets for onshore rivers to reach the sea, so they flush the sand out. b. Rapid flow of water back and forth through the inlet as tides rise and fall keeps it clear. c. Longshore sand drifted into such inlets drops into deeper water, so it drifts out to sea. d. Sand drifted into such inlets encounters brackish water from the inlet and dissolves. e. Sand drifted into such inlets is carried into the lagoon by incoming waves.
Which of the following is NOT a consequence that we are seeing now?
A. During the last century, global average temperature has increased by 0.6°C. B. 19 of the 20 hottest years on record have occurred since 1980. C. Coral reefs are bleaching due to increased ocean temperatures. D. Arctic sea ice has approximately 50% of its thickness compared to 30 years ago. E. All of these statements are true.