Which of the following statement is False:

A.Cinder cones are built from ejected lava fragments and are usually less than 300 meters high
B.Calderas are large collapsed depressions having more or less circular form
C.Most volcanoes are fed magma through short conduits called pipes that connect a magma chamber to the surface
D. Sills are tabular discordant bodies that are produced when magma is injected into fractures

The false statement is D. Sills are tabular discordant bodies that are produced when magma is injected into fractures.

To determine which of the statements is false, let's go through each statement one by one:

A. "Cinder cones are built from ejected lava fragments and are usually less than 300 meters high."

To verify this statement, we can examine the characteristics of cinder cones. Cinder cones are indeed formed from ejected lava fragments, which are usually small and solidified before reaching the ground. Additionally, cinder cones are generally smaller in size compared to other volcano types. They typically range from a few tens to a few hundred meters in height. Therefore, statement A is true.

B. "Calderas are large collapsed depressions having more or less circular form."

To verify this statement, we can look at the definition and features of calderas. A caldera is a large crater-like depression that forms when a volcanic eruption empties the underlying magma chamber, causing the volcano to collapse. Calderas are indeed characterized by their large size and often have a more or less circular shape due to the collapse. Therefore, statement B is true.

C. "Most volcanoes are fed magma through short conduits called pipes that connect a magma chamber to the surface."

To verify this statement, we can examine the mechanism of how magma feeds volcanoes. Most volcanoes are indeed fed by magma that rises through conduits or channels extending from a magma chamber to the surface. These conduits can vary in length and width, but the term "pipe" is commonly used to describe this type of conduit. Therefore, statement C is true.

D. "Sills are tabular discordant bodies that are produced when magma is injected into fractures."

To verify this statement, we can examine the characteristics of sills. Sills are indeed tabular bodies formed when magma is injected between layers of preexisting rock, often parallel to the bedding planes. Sills are concordant, meaning they have a close relationship with the existing rock layers and generally do not cut through them. Therefore, statement D is true.

After evaluating each statement, we can conclude that all the statements are true.