1. scientists can use rock layers to determine which of the following?
a. the mass of earth
b. the size of earth
c. the age of earth
d. the amount of land on earth

2. fossils in layers of rock are generally estimated to be than fossils found in the deeper layers.
a. older, younger
b. newer, younger
c. older, older
d. newer, older

3. new evidence can lead to a change in scientific knowledge
true or false

1. Age of earth 2. D. Newer, Older 3. True

Explanation:

consider the reaction below.

 no rx

at 500 k, the reaction is at equilibrium with the following concentrations.

[pci5]= 0.0095 m

[pci3] = 0.020

[ci2] = 0.020 m

what is the equilibrium constant for the given reaction?

0.042

0.42

2.4

24

answer: any goods being imported from another country may be subject to issued by the federal government are tariffs

explanation:  

tariffs are a tax on anything that are imported from abroad. government use them to protect and boost their local industries and the thought is that they encourage consumers to buy local instead of importing and they will hope will protect jobs and economy in the country that implements them