A

Why was Wegener's theory not supported at first?

• his evidence was lacking

• his could not explain the fossil record.

• his lack of scientific background

• he could not explain what caused the continents to move.

This is a picture of glacier scars found in Africa.  What are these evidence for?

• Africa has always been near the equator

• Africa was once in an area of the Earth that had a very cold climate

• The continents have not moved

• sea floor spreading

Tags

NGSS.HS-ESS1-5

NGSS.HS-ESS1-6

What evidence of Wegener's Theory is shown in the remains of organisms that lived long time ago?

• embryology

• continental drift

• seafloor spreading

• fossils

Tags

NGSS.HS-LS4-1

NGSS.HS-LS4-5

Which is the remains, traces, or imprint of an ancient living thing preserved in rock?

• glacier

• Pangaea

• fossil

• Ice Age

Tags

NGSS.MS-LS4-1

Which of the following correctly describes the main sequence stage of a star's life cycle?

• The star is collapsing due to gravity

• The star is fusing hydrogen into helium in its core

• The star is expanding into a red giant

• The star is cooling down as a white dwarf

Tags

NGSS.HS-ESS1-1

You discover a new star and plot its position on the Hertzsprung-Russell diagram. It appears above and to the right of the main sequence. Considering its position and the stages of stellar evolution, formulate a hypothesis about this star's current state and its future development. Which of the following is the most plausible explanation?

• It's a neutron star resulting from a recent supernova explosion

• It's a red giant that may eventually shed its outer layers and become a planetary nebula

• It's a white dwarf that has completed its life cycle and will slowly cool

• It's a main sequence star that will remain stable for billions of years

What causes a star to enter into the red giant stage of a star.

• The star explodes.

• The star runs out of Helium.

• The star runs out of Hydrogen.

• Gravity pulls it apart.

Tags

NGSS.HS-ESS1-1

An astronomer observes two stars with the same surface temperature but different luminosities on the Hertzsprung-Russell diagram. Star A is more luminous than Star B. What can be inferred about the relative sizes of these stars?

• Star A is smaller than Star B

• Star A is the same size as Star B

• Star A is larger than Star B

• The size cannot be determined from this information alone

On the Hertzsprung-Russell diagram, the hottest and brightest stars are typically located in the (a)   .

• Upper right corner

• Lower left corner

• Upper left corner

• Lower right corner

The characteristic of a star that determines its position on the main sequence of the Hertzsprung-Russell diagram is (a)  

• Age

• Color

• Distance from Earth

• Mass