Explain coronae
What will be an ideal response?
Many features on Venus testify to its volcanic history. Long, narrow lava channels meander for thousands of kilometers. Radar maps reveal many volcanoes, faults, and sunken regions produced when magma below the surface drained away. Other volcanic features include the coronae, circular bulges up to 2600 km (1600 mi) in diameter bordered by fractures, volcanoes, and lava flows. These appear to be produced by rising convection currents of molten magma that push up under the crust. When the magma withdraws, the crust sinks back, and the circular fractures mark the edge of the original upwelling.
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The temperature of a protostar can reach 1,500 K but they are very hard to detect in visible wavelengths because of their low luminosity and because they are surrounded by dust.
Answer the following statement true (T) or false (F)
The node of a standing wave represents a point of
A. no motion B. maximum motion
Protostars can be observed in
A) the Crab Nebula. B) the Andromeda Galaxy. C) the Orion Nebula. D) our Solar System. E) the Helix Nebula.
As water changes to ice, water molecules
A) absorb energy. B) release energy. C) retain their energy. D) lose the quality of wetness.