Letters to the Editor

19357

By Science News

- More than 2 years ago

In this article, the white cliffs of Dover are offered as a “notable example” of the precipitated carbonate deposits some have expected to find had Mars been wet and warm in the past. The Dover chalks are an unfortunate choice for comparison because they’re composed primarily of the calcitic remains of microscopic marine phytoplankton. As most carbonate sediments on Earth are the result of direct or indirect biogenic activity, extensive examples of inorganically precipitated carbonate sediments will be hard to find.

K.M. Towe
Tennille, Ga.

Use up and down arrow keys to explore.Use right arrow key to move into the list.Use left arrow key to move back to the parent list.Use tab key to enter the current list item.Use escape to exit the menu.Use the Shift key with the Tab key to tab back to the search input.