Which of the following happens during a lunar eclipse?

select one:
a. earth casts a shadow on the moon.
b. the moon casts a shadow on earth.
c. earth stops revolving in its orbit.
d. earth starts revolving around the moon.

Agroup of students is studying convection currents. they fill two identical balloons with the same amount of helium. one balloon is placed in a freezer and the other in an area with warm air. after 10 minutes, the balloons are released from a height of 1 meter. which of the following do the students most likely observe? a. the balloons both rise. the cold balloon is larger than the warm balloon. b. the balloons rise at the same rate. both balloons are the same size. c. the warm balloon expands and rises. the cold balloon shrinks and sinks. d. the cold balloon expands and rises. the warm balloon shrinks and sinks.

George is a dalmatian puppy. describe what happens to light that allows you to see george’s black and white coat.

Which property of a rock remains unchanged by mechanical weathering? a. total surface area b. size and shape c. mineral composition d. sharpness