I need someone to check my work please!

1. A delta is made up of _______.
a. melted iron
b. sharp rocks
c. gullies
d. sand and soil ******

2. Underwater canyons form on the _________.
a. continental slope ******
b. continental rise
c. ocean ridges
d. drainage basins

3. Earth's crust is made up of _________.
a. water
b. rock
c. iron *****
d. sand

4. Study the illustration below.
layers of the Earth and it's pointing to the 2nd layer
a. outer core
b. inner core
c. mantle*****
d. crust

5. Each of these are examples of Earth's underwater features EXCEPT ________.
a. the outer core*****
b. the continental shelf
c. the continental slope
d. the ocean ridge

6. Which layer of Earth is the thinnest?
a. crust*****
b. outer core
c. inner core
d. mantle

#3 is rock

1.D
2.A
3.B
4.C
5.A
6.A
Thanks for the help :(

To check your work, let's go through each question and its options one by one:

1. A delta is made up of _______.
To answer this question, we need to understand what a delta is. A delta is a landform created by the deposition of sediment where a river meets a body of water, typically the ocean or a lake. It is formed when the velocity of the water decreases, causing sediment (such as sand and soil) to settle out and form a landform. Therefore, the correct answer is option d: sand and soil.

2. Underwater canyons form on the _________.
To determine where underwater canyons form, we need to know the geological features of the ocean floor. Underwater canyons are typically found on the continental slope, which is the steep gradient leading from the continental shelf (the shallow part of the ocean near the coastline) to the deep floor of the ocean. Therefore, the correct answer is option a: continental slope.

3. Earth's crust is made up of _________.
The Earth's crust is the outermost layer of the Earth and is composed primarily of rock. Therefore, the correct answer is option b: rock.

4. Study the illustration below.
layers of the Earth, and it's pointing to the 2nd layer
To answer this question, we need to understand the layers of the Earth. From the innermost to outermost layers, they are the inner core, outer core, mantle, and crust. The illustration points to the second layer, which is the mantle. Therefore, the correct answer is option c: mantle.

5. Each of these are examples of Earth's underwater features EXCEPT ________.
To answer this question, we need to identify the option that is not an underwater feature. The correct answer is option a: the outer core. The outer core is found beneath the Earth's mantle, but it is not considered an underwater feature.

6. Which layer of Earth is the thinnest?
From the previous question, we know that the layers of the Earth, from innermost to outermost, are the inner core, outer core, mantle, and crust. The crust is the outermost layer and is relatively thin compared to the other layers. Therefore, the correct answer is option a: crust.

Now that we have reviewed each question and its options, you can compare your answers to the correct answers provided above.