This topic contains a solution. Click here to go to the answer
« previous next »

Author Question: Twelve hours of daytime and twelve hours of nighttime occur at every location on Earth whenever the ... (Read 89 times)

bclement10

  • Hero Member
  • *****
  • Posts: 560
on: Jul 28, 2018
Twelve hours of daytime and twelve hours of nighttime occur at every location on Earth whenever the Sun reaches the
 a. north or south celestial pole.
  b. celestial prime meridian.
  c. vernal or autumnal equinox.
  d. ecliptic.

Question 2

Niels Bohr focused his attention on the element hydrogen because it
 a. could be obtained in extremely high purity.
  b. was so abundant.
  c. had the simplest atom.
  d. was inexpensive.


Related Topics

Need homework help now?

Ask unlimited questions for free

Ask a Question
Marked as best answer by a Subject Expert

lkanara2

  • Sr. Member
  • ****
  • Posts: 329
Reply #1 on: Jul 28, 2018
Answer to Question 1

c

Answer to Question 2

c


bclement10

  • Hero Member
  • *****
  • Posts: 560
Reply #2 on: Jul 28, 2018
Both answers were spot on, thank you once again


lkanara2

  • Sr. Member
  • ****
  • Posts: 329
Reply #3 on: Jul 28, 2018
Great! Please up vote :D


« previous next »
 

Did you know?

Eating carrots will improve your eyesight. Carrots are high in vitamin A (retinol), which is essential for good vision. It can also be found in milk, cheese, egg yolks, and liver.

Did you know?

The liver is the only organ that has the ability to regenerate itself after certain types of damage. As much as 25% of the liver can be removed, and it will still regenerate back to its original shape and size. However, the liver cannot regenerate after severe damage caused by alcohol.

Did you know?

Only one in 10 cancer deaths is caused by the primary tumor. The vast majority of cancer mortality is caused by cells breaking away from the main tumor and metastasizing to other parts of the body, such as the brain, bones, or liver.

Did you know?

Asthma-like symptoms were first recorded about 3,500 years ago in Egypt. The first manuscript specifically written about asthma was in the year 1190, describing a condition characterized by sudden breathlessness. The treatments listed in this manuscript include chicken soup, herbs, and sexual abstinence.

Did you know?

Interferon was scarce and expensive until 1980, when the interferon gene was inserted into bacteria using recombinant DNA technology, allowing for mass cultivation and purification from bacterial cultures.

Earth Earth
Solar EM Radiation Penetration into Earth's Atmosphere Solar EM Radiation Penetration into Earth's Atmosphere
Psalter and Hours of Bonne of Luxembourg, Duchess of Normandy Psalter and Hours of Bonne of Luxembourg, Duchess of Normandy
Modification steps (1–4) that occur in maturation of E. coli tRNATyr from its transcript Modification steps (1–4) that occur in maturation of E. coli tRNATyr from its transcript
Geothermal energy and powers Earth’s systems Geothermal energy and powers Earth’s systems
Earth emits radiation back out to space from all surfaces, both day and night Earth emits radiation back out to space from all surfaces, both day and night
Video: Digestive chemicals - types & enzymes

For a complete list of videos, visit our video library