Select all that are true about the crust. makes up 84% of the earth's volume has the most magnesium mostly made of nickel and iron thinnest layer on earth mostly made of silicon and aluminum

## Step 1: <br />The first statement is "makes up 84% of the earth's volume". This is not true. The crust does not make up 84% of the Earth's volume. In fact, it only makes up about 1% of the Earth's volume.<br /><br />## Step 2: <br />The second statement is "has the most magnesium". This is also not true. The Earth's crust does not have the most magnesium. The mantle has a higher concentration of magnesium.<br /><br />## Step 3: <br />The third statement is "mostly made of nickel and iron". This is not true. The Earth's crust is not mostly made of nickel and iron. These elements are more abundant in the Earth's core.<br /><br />## Step 4: <br />The fourth statement is "thinnest layer on earth". This is true. The Earth's crust is indeed the thinnest layer, with an average thickness of about 30 kilometers.<br /><br />## Step 5: <br />The fifth statement is "mostly made of silicon and aluminum". This is true. The Earth's crust is primarily composed of silicon and aluminum, which form various minerals and rocks.